Preflight

lecture preflight 09
1: The handle of a hammer works like a lever (leverage) and allows a person to apply more force to the nail than they would be able to with out the hammer. A longer hammer has more leverage which decreases the amount of force the person needs to exert on the nail. The short handle has less leverage so the person must exert more force to remove the same nail. Therefore, the longer handle makes the job easier.
2: In principle it makes sense. He would need a HUGE lever and, as he said, a place to stand. There are many resons this will never happen because the size of the lever is so large it is difficult to imagine, I VERY strong material would have to be used for the lever, and the characteristics of space (no air, no where to stand, gravity, orbit, etc.) make this impossible.
3: In the summer, I work at a camp and I raise the flag up and down on the flag pole which is the use of a pulley. During the mowing season, my lawnmower is in a shed that requires a ramp to drive it out. If the ramp was not there the mower-deck would get bent-up because there is a drop off between the floor and the ground of about 8 inches.
4: I did not know that even though the balls are different masses, that when they rolled down the different slopes, the times should all be the same. The masses cancel out and the slopes change and height make them all fall at the same time.
5: There are antibiotics for illnesses that are bacteria based, why isn't there something for viruses?

lecture preflight 09
1: The longer the handle, the less force is needed to pull out the nail because you have an advantage. The longer handle has a farther distance to travel, and so it requires less force than if it had a smaller handle and required more force to lift the nail.
2: I suppose. Although I'm not sure about how. He'd need to know where to put the fulcrum, I think he'd have to put it close to the earth, and how much downward force to apply to lift the weight of the earth.
3: Elevators have pulleys that raise and lower the car. See-saws on the playground are levers that, when a force or weight is applied to one end, the other end raises up.
4: I didn't really learn anything. I'm still really, REALLY confused!
5: Roller coasters... why don't we fall out?

lecture preflight 09
1: I think it works better to be a longer handle becuase you can use more force. For instance, if you couldnt get a pop can to open, you might use a butter knife or something to push it open. I think this is similar to using the hammer to pull out the nail.
2: Well using a lever can move pretty heavy objects with little force, but I don't think he oculd move the earth. The earth contains so much mass that I'm pretty sure it would be impossible.
3: When you drive your car, you are using a wheel and axle simple machine. The axle is stationary but the wheel moves around it. We also use door stops all of the time, which is an example of a wedge, but I'm not sure how they work.
4:
5: How do vaccines work? I know they inject you with a small amount of the virus or whatever, but why doesn't your body react to that negatively?

lecture preflight 09
1: because the hammer acts as a lever, so it takes less force to move the handle a long distance, which inturn moves the nail a short distance
2: there would have to be something solid to rest on in between the earth and Archimedes.
3: an inclined plane, such as a ramp, makes it possible to raise things up with minimal force because the distance in which it is being lifted is spread out. i also use a lever type of simple machine to open bottles with a bottle opener, this decreases the force i need to use by spreading if over a long distance
4: i learned how pulleys work
5: why does the wind whistle when it blows?

lecture preflight 09
1: The longer the handle, the less force is needed to pull the nail out of the wood.
2: Based on our experiments with the fulcrum, paint stick, and washers this would make sense. But, in reality, there are so many other forces acting on the earth in outer space that I don't understand how this would work.
3: Hair straigtener: By pushing down on the top of the straightener, it hits the bottom of the straightener. This is very similar to the fulcrum we were using in class...the fulcrum is at the end of the straighter and supports the top of the straightener when I push it into the bottom of the straightener. Curling iron: this works the same way as the straightener does
4: By using multiple pulleys, you can reduce the force that is needed to make an object move.
5: How does air conditioning work?

lecture preflight 09
1: The load is the force of the nail on the hammer. The fulcrum is the round part of the hammer head. The effort is your pull on the handle. The hammer is being used as a bent lever to pull out the nail.
2: Well I don't think he meant it literally. I think that Archimedes just meant that if you have a lever large enough you can move very heavy things. An example is that a lever can raise a heavy car.
3: A ramp is also called an inclined plane is something I use often especailly when rolling suitcases places. By rolling an object up a hill or a ramp, you require less strength than required to pick the object up the same height, but you compensate by traveling a greater distance. This ability to move an object to another height works the same as with a lever. Another example is there is a pulley with my blinds. When I pull down on the string the pulley lifts the blinds.
4: That even if something is very heavy you can come up with a device that requires very little force for you to lift it.
5: How is there different magifications to a mirror?

lecture preflight 09
1: Because the distance between you and the fulcrum is longer (fulcrum is the part of the hammer teeth that rests on the wood).
2: Yes. At least, according to Joe. But, you need a fulcrum point really close to the earth and a sturdy place to stand that is not on the earth and really, that's not possible. But, sure Archimedes, you do your thing...
3: Using a corkscrew uses the concept of the lever (at least the kind I have is) because you push down on one side and the other side raises up, pulling the cork with it. Sweeping is a kind of lever, because my bottom hand holding the broom stays in one place and my top hand moves slightly. Because the distance between my hands is smaller than the distance between my bottom hand and the floor, the bottom part of the broom moves more and sweeps without expending much energy.
4: We had a hard time figuring out the pulley system without first drawing it and then as soon as I drew it, it made sense.
5: Why do bananas turn brown really quickly if I put them in my bag?

lecture preflight 09
1: By using a longer handle you are increasing the distance that work is being done over, which would decrease the force that is needed to do the work.
2: Yes, if the handle is long enough to decrease the force needed to move the earth so that a single person could do so, then yes it would be possible.
3: 1. A string on the blinds is a pulley. 2. A handicapped ramp to get into a building is an inclined plane.
4: I thought it was very interesting how all the balls were moving at the same speed at the end of the ramp. Mass didn't matter because they had to same potential energy, so they also had the same kinetic energy.
5: How do you not fall out a rollercoaster when it goes upside down?

lecture preflight 09
1: because the hammer works as a lever and the longer the lever the less force it takes to pull out the nail
2: yes if archimedes was a giant being, larger than the earth. he's just making the point that a long lever can do an incredible amount of work.
3: the cap on water bottles is a screw that keeps the water contained in the bottle because of the threads. Also ramps around campus are inclined planes and they make it harder or more difficult to walk on depending on which way you travel
4: more about levers and pulleys
5: can you find an elephant on google earth?

lecture preflight 09
1: The long handle has more leverage.
2: yes! but he'd have to have a lot of room
3: Raising the flag in the morning-you use a pulley Wheel and axle- I drive a car
4: That I don't understand simple machines at all and I still don't.
5: How do pulleys work

lecture preflight 09
1: When you increase the distance, the force on the nail decreases which makes it easier to complete the work necessary to pull the nail out.
2: Yes, this does make sense (aside from all the earth orbiting in space stuff) because if you had a long enough lever with a fulcrum in the appropriate place, you could make a ratio in which you could stand on one end and lift the earth. The distance would have to be so large that the necessary force would be small enough where a human being could complete the work.
3: Blinds are pulley's (pull the strings and the blinds go up and down) and Teeter-Totter's at a playground are levers (children sit on either side).
4: I learned that there is no work done when it comes to levers because all the forces cancel out.
5: What are simple machines that we use everyday that we probably don't realize?

lecture preflight 09
1: Because the handle acts as a lever. The longer handle means you need to apply less force where you push down cause the top of the hammer is closer to the nail.
2: Yes, because the longer the level the less force you need to apply to be able to move something.
3: An elevator is an example of a simple machine because it uses a systems of pulleys to lift the weight. With pulleys if you pull done on it once it pulls up twice, so depending on the number of pulleys a lot of work can be done by applying not that much force. A ramp to help move heavy objects. You are still moving the object the same distance but since it is over a greater distance you have to apply less force.
4: That the same amount of work is done as long as an object is moved to the same height. It doesnt matter how long or short the path is that moves that object.
5: How do tides work?

lecture preflight 09
1: It is easier using a hammer with a long handle because the more distance there is than the less force required.
2: Yes! Even though unrealistic, it still makes sense because the force times the lengh of the lever will equal how much work is required to move the Earth.
3: Opening the blinds is like a simple machine. I pull down on the string and it opens the blinds and then pulling down on it in another way brings them down. It is a simple but sophisticating system. A second simple machine is the ramp into my house because it is an inclined plane that connects the lower ground level to a higher level where the door is.
4: I learned that no matter what kind of ball and what kind of ramp, if rolled from the same height they will move at the same speed at the bottom of the ramp.
5: How long would Archimedes lever have to be?

lecture preflight 09
1: shorter distance
2: yes long distance minimal force
3: pulleys and doors?
4: pulley and buckets
5: would increasing the number of pulleys decrease f?

lecture preflight 09
1: Because of the distance and force applied to it. Longer distances use a small amount of force while shorter distances require a large amount of force
2: Yes, although he would need an extremely heavy lever (not a ruler like we used in lab)
3: Straighten for my hair and it works by pulling the lever/handle so the two hot ends come together and press against my hair. Another simple machine is my blowdryer. I have to turn on the power and then out comes hot air.
4: That I don't work with pully's very well
5: I know paper comes from trees, but how exactly is it made?

lecture preflight 09
1: The hammer with the long handle gives you more leverage.
2: No, becasue there is no solid object to place a lever on. In theory, i guess it would work, but in reality I dont think he could set his lever anywhere is space.
3: When I am in the weight room, I use alot of pulleys. Another one is would be a can opener.
4: I learned how to calculate the force needed depending on where the fulcrum is on a lever.
5: What is fire?

lecture preflight 09
1: The handle is longer and requires less force.
2: Yes, a long lever makes a small amount of force move a large force.
3: A toilet handle and sink handle. They both work like levers.
4: How a pulley reduces force.
5: What happens when you consider the stiffness of a lever? Will the amount of work decrease if the lever bends a little?

lecture preflight 09
1: It is easier because you end up having more leverage if it has a longer handle, making you need less force to get the nail out.
2: It does make sense, because as we discussed in lab; it is possible to move a car if you had a long enough lever. Now to move the earth it would just have to be an enormously big lever.
3: At home we keep our bikes in the garage and they're hung from the ceiling with two hooks that are attached to strings and pulleys. In order to get them down, we have to release the string a little at a time and it works just like our pulley design worked in lab.
4: That it doesnt matter the weight or size of the ball rolling down the board, they will both travel the same distance in a given time when they hit the floor; i would've never guessed that.
5: What makes Chicago "the windy city"? Certainly there are other cities around the world that are by a lake, why is it that Chicago has such strong winds?

lecture preflight 09
1: It is easier to use the hammer with the long handle because it simply requires less work.
2: It does because in order to produce work Archimedes would only need force and distance.
3: An elevator and eliptical machine, both depend on the pulley systen
4: I learned that speed is distance over time
5: What is the best way to form and operate a pulley system, is it similar to that of a well?

lecture preflight 09
1: It is easier with a longer handle because work is distance times force. The greater the distance, or length of the handle, the less force is required to do the work. The shorter length hammer handle requires more force to remove the nail.
2: Well, it is true that the more length you have the less force that is required to move an object of any mass. This would theoretically be true, but obviously it is not something that would likely be done.
3: First, there is a lever on the garbage can. It lifts the the lid of the garbage can. Also, the trunk of my car opens with a hinge.
4: I thought it was interesting that a fulcrum could make it easier to lift a heavy object.
5: Why do the sidewalks flood here at U of I?

lecture preflight 09
1: You utilize less force with a greater distance for the same work because work equals force times distance.
2: If gravity weren't a factor, I think this could be possible as long as the person had a stable ground to stand on.
3: I walk up and down a ramp to get inside my house on a daily basis. This is an incline and it decreases the amount of work I would need to take to get to my door because it increases the distance as opposed to taking a direct step into the door. When I lower my desk chair I am using a lever in order for the chair to decrease. All I need to do is exert a force of pulling up on the lever and in turn the chair falls with ease.
4: I have learned about the work equation equaling distance and force.
5: How do staples work?

lecture preflight 09
1: because the amount of force you must use is spread out over a longer distance, and therefore less force is used per distance
2: no. he is standing on the earth. the only conceviable way you could do that is if he were outer space, and there is no way that is possible because he would be pulled out of outerspace before the earth moved
3: a door handle that is a lever, the lever spins something that allows the door to unlock and open. an elevator. that uses pullies to lift people.
4: there is such a thing as fudge otmeal cookies that have no fat or some healthy fact. **these are the best cookies we have had yet**
5: how do car engines work

lecture preflight 09
1: It requires less less force to pull the nail out with a longer length.
2: Yes if it was extremely long in the universe/
3: The door locks. You have to swipe your card and it reads the code and unlocks the door. The door of the bus. You pull on the lever and the door opens and closes.
4: How to use and make a pulley.
5: none

lecture preflight 09
1: Because work = force x distance, increasing the distance (length of the handle) decreases the amount of force you must apply
2: No... because the earth isn't resting upon anything that it could be moved off of
3: 1. Ramps to get to the doorway on a building (if the doorway is a few feet off the ground) -- the ramp is an inclined plane. Though it takes more time to get from the starting to ending location, the force is spread over a ramp rather (it's way easier to walk up a ramp to get 5 feet off the ground than it would be to jump) 2. Screws that hold together the furniture in my room - the screw is a version of an inclined plane and works like the inclined plane does; force is wrapped around an inclined plane which is shaped in a spiral
4: I thought it was interesting that all the balls had the same time from point a to point b after released from the inclined plane; I thought the distance would have made a difference
5: Why do ginko trees loose all of their leaves at the same time, when most other trees gradually lose their leaves?

lecture preflight 09
1: Because there is more leverage with the long handle.
2: It makes sense if his place to stand was on another planet.
3: The tops on pop cans and a stapler
4: That simple machines are really all around us.
5: Does heavy wind predict bad weather and if so how many days after will the bad weather come?

lecture preflight 09
1: Torque equals force times distance. In this case the distance is the length of the handle, so the longer the handle, the greater the torque and then easier it is to remove the nail.
2: yes, the earth only weighs so much, so if you have a long enough level you could move the earth with relatively little force
3: A doorstop is a wedge. When the door hits it, it pushes down on the doorstop which creates more friction than the door pushes across. A corkscrew is an example of torque. It is much easier to remove a cork with a corkscrew than it is to pull it out manually.
4: How much easier pullys make things to lift. It was much much easier to lift the bucket with a pully.
5: What happens when a star collapses?

lecture preflight 09
1: F1D1 = F2D2 if the distance is greater, then the force needs to be less for the nail to be removed.
2: Yes, but it would have to be incredibly long. If a lever is placed underneath something, it can move an object.
3: The wheel and axle are simple machines that are used in my everyday life on a bike...they work because the axle runs through the wheel and is the way the wheel can spin. Scissors are double-lever simple machines with the hinge of the scissors acting as the fulcrum. The force applied to the handle makes the scissors move and cut an object.
4: learned more about simple machines and their everyday purposes--they are all around.
5: Why does tin foil keep things warm?

lecture preflight 09
1: The long handle gives the puller greater stability. Like the lever, you need a greater force opposite the end of the nail to pull the nail out of the wood.
2: If we could find a weight strong enough, and the correct place to position the lever, maybe it could be possible. I am really confused with this question??
3: -Ramps onto highways. Highway ramps are like the ramps we built in class. Some have a steep or gentle slope, some have different lengths, but if they are at the same height, a driver will spend the same amount of time on them (if at the same speed both times). -Another simple machine is window blinds. When you open up blinds, you pull on a string, which is attached to a pulley, to pull the blinds upward.
4: How to attach a single pulley to a double pulley. I also didn't realize that even though ramps have different lengths and slopes, as long as the height is the same, the speed of the objects falling will also be the same.
5: Is white smoke bad for you? For example, there is a factory near my dorm that spits out smoke all day long. The smoke is white. Is this colored smoke harmful to me like black smoke is?

lecture preflight 09
1: You have more leverage with a longer handle, and thus it does not take as much force by you to remove the nail.
2: Realistically it does not makes sense because the logical aspects of moving the earth would not allow that. However, hypothetically, it would work because in principle his statement is true.
3: My cell phone has a button on the side that when you click it, the flip phone automatically opens. Although it looks very impressive, the simple mechanics are that there is a wound up spring within the plastic that is moving to allow the phone to open. I use an elevator to enter and exit my apartment building every day. Although the mechanics of the elevator are complicated, it comes down to a simple lever and pulley system that raises and drops the cabin.
4: I learned how to use rope and a pulley to lift a significally much heavier weight than the force used to lift it. Although I have seen this done in other venues throughout my life, I never understood the simple mechanics behind it.
5: Do the elevators in very tall skyscrappers work in a similar fashion as elevators in a shorter building?

lecture preflight 09
1: you have more leverage over the nail
2: as long as there was a place for him to stand and a fulcrum for the lever it makes sense that he could move the earth relative to himself.
3: opening and closing window shades is an example of a pulley in use. when you open the shade you pull on a chord that lifts the shades.
4: By using a pully, you can drastically reduce the force needed to lift something, and the configuration of the pully has a lot to do with how much the force is reduced by.
5: what causes tornadoes?

lecture preflight 09
1: This is because work equals force x distance, so if the distance is longer, then the force will be less.
2: He is explaining how a lever works and how it can be altered to move something very, very large. It does makes sense, although I don't think he would ever have been able to show this example.
3: Two simple machines that I use are: a bottle opener where you screw into the bottle and then push down on two levers on the side which makes it easy to open something with a large force. Another simple machine that I use is a treadmill. When I workout, I set the incline of the treadmill very high to increase the force that I must use, making my workout more difficult.
4: I learned more about the idea behind a see-saw setup.
5: What makes fog occur?

lecture preflight 09
1: It is easier to pull a nail out of a piece of wood using a hammer with a long handle compared to using a hammer with a short handle because with a longer handle, you have more leverage to pull the nail out. The length of the handle helps you to put more force on the nail while exerting a smaller force, so it will be easier to pull out.
2: Yes because if the lever is incredibly long and he placed the fulcrum closest to the earth, he could essentially stand on one end and lift the earth.
3: A pop can tab is one example of a simple machine because you are using leverage of the tab to make the can open. Another simple machine is a scotch tape dispenser because the tape is on a roll like a half-pulley and when you pull on the tape it comes off the roll because the roll is connected to a piece of plastic that holds it in place.
4: I thought it was very interesting that the work will always center around 1.1 J, no matter the distance or force.
5: Is it true that you can die while cleaning your house if you are using products that contain chlorine and ammonia together?

lecture preflight 09
1: It is easier because you do not have to use as much force to pull the nail out because of the distance of the hammer. W=FD
2: Yes, but the lever has to be extremely long and gravity would have to be accountable.
3: A clock is a simple machine with just a wheel and axel. Also the ramps to enter a building make it easier to enter than walking up stairs. It is simple because it is just on an incline.
4: A heavy and small ball take the same amount of time to fall down a ramp. Also the fact that half the ramp and the whole ramp also take the same amount of time, which I didnt find true but apparently it is.
5: How come you can see the suns rays through the clouds only on certain days or every once in a while?

lecture preflight 09
1: It is because work = force x distance. For exapmle, if work were to equal 10, and the distance of the hammer handle was ten than the force would equal one. If the handle was half that length (5) then the force would be twice as much.
2: Yes it does, because of the same reason as above. Moving the earth would be a lot of work, but with enough distance, the force would be manageable.
3: How about a weight machine that is on a system of pullies. The work the same way the bucket did in class except you are the one pulling down on the bar (force) to lift the weights. Maybe a paper towel dispenser? You apply the force on the handle, or lever, and and as that goes down it causes something else to go up which causes the paper towels to be dispensed.
4: I thought it was interesting to see the proportions with the teeter-totter device, and it helped me to understand the concept of work = force x distance.
5: What causes a tsunami?

lecture preflight 09
1: Because you need less force because you are exerting it over a longer distance.
2: Yes, but the lever would have to be huge, and would probably have to go out of the atmosphere.
3: My garbage can, I push down a lever, and the lid opens!!
4: I learned about pulleys-they are tricky!!
5: What are some things we can do to stop global warming?

lecture preflight 09
1: less force with the long handle
2: not really but in a way it does because the longer your lever is the less force you need to lift/move something
3: i lift weigths and the lat pull down acts as a sort of a pulley when i ride a stationary bike i move arm handles and it moves the foot pedals. it is like a lever because the arm handles are longer than the foot ones because the foot ones are heavier to move and therefore the long arms make it easier to move
4: less force for a longer lever
5: how come our hair gets lighter in the sun?

lecture preflight 09
1: I could get better leverage by pulling it out with a hammer with a long handle. The force would be spread throughout the handle making it less strenuous.
2: Technically yes, but scientifically no. You can't put the earth on a lever, but the concept of moving very large and heavy things can be true by using levers.
3: I open doors, and the handles are placed on the inner side of the door so that there is more of an angle to swing it open rather than placing the handle in the middle of the door. Another machine I use is a spinal board at work. I need to enter the board into the water at the appropriate angle when trying to get a victim out of the water otherwise the board will not stay steadily against the wall.
4: I learned that although I would only be weaving a rope through pulleys, I could minimize the force needed to lift an object by doing this.
5: Why does pressure increase deeper in the ocean?

lecture preflight 09
1: Work is the product of force and distance. The longer the distance (or length) of the handle, the less force is required for the work to pull the nail out.
2: Although this is really impossible to do, it makes sense. The ratio of the force on each side of the lever must be equal to the ratio of the heights of each side. Archimedes would need an extremely long lever to move the earth.
3: I use the simple machine of a ramp to get from one level to a higher level. An inclined surface is an efficient way to push a wheel chair or stroller to the next level. I also use elevators which use the simple machine of the pully. It uses motorized cables to pull the heavy weight of the elevator to different floors in a building.
4: If friction did not effect an object's movement, then there would always be a constant velocity reguardless of the speed it was moving.
5: How does the forces of gravity and air pressure effect a bird flying in the sky?

lecture preflight 09
1: Because the hammer with a long handle allows for more distance.
2: Yes because it is like the experiment we did with the washers. As long as the heaver washers were close to the folcum, and the other washers had a long distance from the "center" then the heavy washers would be lifted by less weight.
3: I'm not sure exactly what this question is asking for. I would think maybe the string on the blinds. As you pull down on the string with force, the blinds go up and when you want to close the blinds you pull down with a different direction of force. Another simple machine might be a door. As you pull towards you the door opens and as you push away the door closes.
4: Learned what a pulley is used for!
5: How do telephones work....ok so I'm a little confused about how the actually phone works!

lecture preflight 09
1: you can exert more force by using the long handle hammer.
2: yes, just move the fulcrum as close to the earth as needed.
3: working out on a treadmill. the belt is wrapped around something that makes you stay in one place while "walking".
4: the universe really cares about energy, it does not give it away for free.
5: the weather has changed a lot the past month, why is that?

lecture preflight 09
1: the long handle acts as a lever.
2: Yes, because he could put the fulcrum close to the earth its just fairly exaggerated.
3: Me and my roomates use a pully to lift our groceries onto the balcony!
4: Speed is the same for all objects when considering distance and time
5: how much ocean water could you drink before you died?

lecture preflight 09
1: b/c the longer length requires less force to cause the same impact as the shorter length.
2: yes! only if he was in the universe...
3: cooling pad - blow air directly on my laptop's surface to cool the laptop mouse - track amt of movement on the surface
4: pulleys require less force to lift an object
5: none

lecture preflight 09
1: The longer length takes less work because you are using a lever system and thus you are using more mechanical energy than physical.
2: This does not make any sense because the lever would probably have the resources to build it (it would be greater than the Earth. Also, you would have to go so far away that you would not be able to travel that far in your lifetime.
3: I use a can opener every day and I walk on a ramp to get into my dorm every day.
4: I learned how to put together a pulley.
5: If you put a feather and a rock in a vaccum, would they fall at the same time?

lecture preflight 09
1: The length of the handle increases mechanicial advantage, meaning less force on the handle will remove the nail.
2: Yes, but he would have to have a very, very long lever, a place to stand, and move that lever a great vertical distance to move the Earth at a barely measurable distance.
3: Elevators, they are examples of pulleys, because counterweights and multiple pulleys make it easier for the mechanical engine to lift and lower the elevator. Also door handles (not door knobs), because the length of the handle allows you to open the latch of the door with very little force. (although the handle moves farther vertically than the latch does horizontally)
4: Cheap toy trucks don't roll that well. It's important to look for models with a real axle, and possibly bearnings.
5: What happens if a lightning rod isn't grounded?

lecture preflight 09
1: the longer the hammer, the less force necessary to do work
2: yes. obvsiously it couldn't happen, but he would need a lever twice as long as the distance he wants to move the world, which because the world is so big, would be enormous.
3: bike- wheels and axles propel the rider scissors- levers use force against one another
4: gravity only cares about vertical shifts of objects...not about horizontal.
5: How do water reservoirs work?

lecture preflight 09
1: Just like the experiment in lab, with levers, a longer handle allows for more force on the other end.
2: Yes it does....based on the experiment we did this week, as long as you have a long enough lever, and as long as you place the dowel rod/fulcrum very close to the earth, it is possible.
3: Seat belts in cars are awesome! It is a type of pulley system that retracts and locks. Teeter-totters are also simple machines--they are levers.
4: See questions 1 and 2.
5: Why are permanent markers so potent??

lecture preflight 09
1: The longer handle gives a greater distance which, because of the equation work= force * distance, would mean the work would be greater. This would make it easier to pull the nail out with a long handle.
2: If he put the lever underneath the earth and had a fulcrum, he might be able to move the earth by placing the fulcrum very close to the earth and he stood on the lever if it was far from the earth.
3: door knob - like a wheel and axel because it acts as a lever rotating around the fulcrum - then the door knob turns and the door opens ramp - like the inclined plane because the longer the ramp, the less work is needed to be done
4: I didn't realize how hard it was to make a pulley.
5: How are wind tunnels "created"?

lecture preflight 09
1: the lever is longer. it needs to move further but less force is needed.
2: yes
3: doornob=lever the fulcrum is the center and the lever is the radius or the knob. teeter totter= lever kids play on it, different weights balance it.
4: how pulleys work.
5: why is murcury bad for you?

lecture preflight 09
1: The object has a greater distance or length, which means that less force is required to do the same amount of work on the object.
2: He was referring to the formula for work. If the lever was long enough (although it have to be incredibly long), he could potentially move the earth, since the force would in theory not be as large.
3: Weight lifting machines use pulleys. You put a certain amount of force on the weights and the weights exert that force back on to you. A ramp is an example of an inclined plane. While not changing the amount of work done, it can spread that work over a greater time distance, which requires less net force.
4: I learned about the concepts behind such simple machines as pulleys and levers.
5: Why is a screw considered a simple machine?

lecture preflight 09
1: Pulling a nail out of a piece of wood using a hammer with a long handle would than with a short handle because with the longer handle you can apply more force and pressure when trying to take it out.
2: This makes sense if the lever is strong enough becuase the earth is round so it can technically roll over.
3: I would consider my cell phone a simple machine because it has a key board that i can send messages or use the calculator on and it is really easy to use. I would also consider a broom a simple machine because it allows you to collect all the dust together to then dispose of it.
4: One interesting thing i learned in lab this week was that friction can slow down the pace at which an object moves up and down a ramp.
5: what are electrolytes?

lecture preflight 09
1: The hammer acts as a lever with the head of it being the fulcrum and the longer the handle the more the fulcrum is centered towards the nail and not the end you exert force on, making it less force necessary.
2: Yes, because the longer the lever the less force need to move something.
3: The brake pedal in a car, you only exert a little force because it is a lever and it is enought to stop or slow the car. In elevators there are pulleys to help lift the elevator.
4: I learned that if you move an object with a lot of force across a short distance or with little force across a long distance the amount of work you did is the same.
5: What casues extreme cold or hot fronts of weather?

lecture preflight 09
1: Distance times force equals work. You have to work less with a longer distance.
2: Yes...but it'd have to be a VERY long lever and there would BE no place to stand!
3: Elevator and hammer
4: the times are the same when balls are dropped from the same height going down a ramp no matter what their mass is.
5: What is the physics of frisbees?

lecture preflight 09
1: The longer the distance (the longer the handle), the less force is needed.
2: Yes hypothetically, because all he would need to do is place the fulcrum as close as he could to the earth's side of the lever, and stand way at the end of the very very longer lever.
3: Mechanical pencils with force exerted at the top that force lead out at the bottom. See-saws at the park that have a set fulcrum in the middle so the heaviest person always touched the ground.
4: Things actually have the same speed despite the angle from which they roll down from.
5: What is the best way to keep flowers in vases alive for longer?

lecture preflight 09
1: Similar to the experiment involving the ramp and toy truck, the longer the length of something, the less force that is required to move it. In the case of the hammer and nail, the longer handle requires using less force to remove the nail than the hammer with a short handle.
2: This makes sense in a way, because as evident in the steel washers experiment, a given lever can lift pretty much anything depending on the position of the fulcrum and the length of the lever. In effect, the lever is simply exchanging the energy between the two bodies.
3: The pull-down weight machines at the gym that work the arm muscles are an example of a simple machine. In effect, they are a pulley, as when you pull down on the handles once, the weights pull up twice counteracting your force.
4: It takes about 1.1 Joules of force to fight the force of gravity and move something up.
5: Why is Champaign-Urbana so windy?

lecture preflight 09
1: the longer handle functions as a longer lever. more torque.
2: not practically, i don't know of anything strong enough to bear that kind of force. However, it does apply to moving something with the mass of the earth, assuming the fulcrum and the lever are sturdy enough not to break under the strain. If the mass of an object is m then if you position yourself at the end of a 100 ft lever with the fulcrum very near to the object, you can move the object one ft for every 100 you move the lever, requiring 1% of the force normally used. Expand that concept exponentially, and a relatively small force for a large distance could budge the earth.
3: blinds- pulley. Pull down on the string, blind goes up. A screw. Inclined plane- takes less force because it goes a greater distance for each inch it goes downward.
4: How to set up a compound pulley system to reduce the amount of force necessary to lift an object.
5: How does a bike stay upright.- let's review angular momentum.

lecture preflight 09
1: There is better leverage with the long handle hammer.
2: Yes, it does make sense because in lab today I learned that you can move anything with a long enough lever.
3: An elevator -- pulley system. A garage door -- pulley system. In the pulley system, when you pull down, the object goes up. When you let go, the object goes down.
4: I learned that if two objects are moving from the same height, their speed will be the same even if one object is larger than the other.
5: Will there ever be people living on the moon?

lecture preflight 09
1: The long hammer acts as a lever so you need to exert less force than you would with a hammer with a shorter handle.
2: Yes, but the lever would have to be really really long!
3: Stairs are like ramps allowing us to get to a certain point with less force. A shovel allows us to pick up more dirt with less force by acting as a lever.
4: I learned how to set up a pulley system.
5: How does lasik surgery correct vision?

lecture preflight 09
1: because the force is spread out more, making it easier to lift the nail out- because more force can be placed where necessary, but it is still easily spread out.
2: no, because the earth is a bigger force than any lever.
3: Vitamin bottle- screw. you have to unscrew the lid from the bottle to remove the vitamins! Scissors- used as a lever. your fingers pull apart and together to contract the blades.
4: i learned that if you change the postition (steepness) of a ramp it takes the same out of time for a ball to roll down the ramp, despite the different sizes of balls.
5: why does it feel good to itch a scratch? and are you itchy because of dead skin cells?

lecture preflight 09
1: You would be using the same 'work' to pull out the nail, however by using a longer handle you are increasing the distance meaning you would need to apply less force. That's why it is easier with a longer handle.
2: If Archimedes had a long enough lever and a great deal of distance where he could stand, as well as something that would hold the lever up, then sureeeeee he could lift the earth! :)
3: Using a hammer and screw to hang up your favorite tv show poster! the screw is the simple machine. Or an inclined plane when walking down a ramp with your bike or for those using wheel chairs.
4: How to use a pulley!! Our group had a very difficult time with the final competition, We were able to figure out that we needed more distance in order to lift the bucket but could not for the life of us figure out how to incorporate two pulleys!
5: We were cleaning out our fridge the other day with some old left over food from noodles and company, and noticed all this fungus on it! It was very gross, but I guess my question is what makes fungus grow? or I guess what process does it take?

lecture preflight 09
1: When you increase the distance, you decrease the amount of force needed, hence it is easier.
2: Yes; he's using work = force x distance
3: Elevator and dumbwaiter. They both use pulley systems to move distances.
4: Balls that roll down a slope, regardless of their size travel at the same speed.
5: How do TVs work?

lecture preflight 09
1: The work done is the same in both cases however the shorter distance of the short handle requires much more force.
2: Yes this makes sense because he could keep the lever really close on the end of the earth and if the lever is really long it is possible.
3: Hammering a screw in the wall to put up pictures. Wheelchairs for inclined ramps for disabled.
4: If you roll two objects with the same radius and shape from the same height off of a ramp than their mass does not matter and they will have the same speed at the bottom of the ramp.
5: How much heat is created from the friction of tires rubbing when you are driving?

lecture preflight 09
1: Because the long handle absorbs the power more.
2: No i dont understand.
3: can opener--lever, see-saw--lever
4: I learned that the size of the ball does not matter when going down the ramp.
5: What is the atmosphere of Venus like?

lecture preflight 09
1: I would work more easily using a hammer with a long handle because you are applying more force to the object while also using more space within the hammer.
2: I would think that if you compare it to moving objects like we did in class today that it would work. However, since it is the entire earth, there are probably other forces around it that would prevent it from moving.
3: I am not quite sure what you mean by a simple machine but I thought of a sewing machine and a washing machine. A sewing machine just has a lever that moves up and down to weave threat inside and outside of a piece of fabric. A washing machine just fills up with water and has a devise to move the clothing around in order to clean it with the soap and take the germs, etc. out of your clothing.
4: I learned that when you roll two objects down a ramp, they will fall at a similar time. And when you cut the distance in half, it will also have approximately the same speed as the other two objects.
5: does fire have any weight?

lecture preflight 09
1: I think that it is easier because by allowing there to be more space between the hammer and the handle it allows less force to be applied by you. The handle of the hammer reduces the amount of force that is needed.
2: Logicallly no, because the earth can not be moved by a person. However, if you think physically maybe the lever could work like a tetar tauter moving the earth from its position.
3: On my backback there are straps that can be adjusted to balance the weight of the bag. This is a simple machine that is sort of like a pulley because it allows for the weight to be placed in a different location. My bike is also a simple machine, where the chain allows for the wheels to turn making the bike move. I'm not exactly sure what kind of machine this would be, possibly a pulley.
4: I learned that pulleys are very difficult to work with. Also, In order to life something with as little force as possible, you have to have the pulleys positioned in the correct spot for it to work for you.
5: how does a computer mouse work?

lecture preflight 09
1: the same idea as using the fulcrum, the force is applied over a longer period of time and therefore, you dont need as strong a force
2: Yes and no, because it is so heavy that you would need an extremely long lever to make the force small enough to be applied by a human, but earth is in space and so the theory of work is diffeent
3: Elevators, which are similar to using the pulleys and rope like in lab, and a Car jack, similar to the fulcrum exercise.
4: I learned that if you wrap a rope around a pulley multiple times that you are going to use to life something up, for every unit of length that it rises, you actually pull on a multiple of that, equal to how many times the rope is wrapped around. That decreases the force needed to life the object because it is being applied over a period of time.
5: How do light bulbs that seem to have been dipped in something to color the bottom black not burn the substance it was dipped in, since a light bulb burns at such a high intensity?

lecture preflight 09
1: the long handle provides more leverage due to the longer length of the lever arm
2: practically no, but in terms of levers, yes.
3: i used a flatbar as a lever to tear down a roof, and i used a ramp today instead of walking up a set of stairs, which reduced my work
4: i was not in lab this week due to illness, but i basically learned a lot about simple machines when looking at the lab sheets
5: how do airplanes stay in flight?

lecture preflight 09
1: Longer lever; better leverage.
2: Yes, but it would have to be a really long lever!
3: 1. Bottle opener; harder to use a smaller one. 2. Opening the blinds; pulling the string through a pulley
4: I learned that when making the contraption to lift the bucket of water, you need the least amount of string possible, and more string through the pulleys. Also, I learned that no matter what the situation (like the ball and ramp experiment) the work is going to be relative.
5: If a hole is punctured into the window of a plane in flight, will everything be sucked out?

lecture preflight 09
1: It is easier because you don't need to use as much force since there is a longer distance.
2: Yes because work is equal to force times distance. As long as his lever was long enough he could only need a little force to do a lot of work.
3: In my everyday life i use weight machines at CRCE and I noticed that they all have pulleys. The pulleys act to in response to the movement of the machine to lift the weights up and down. I also use elevators which use pulleys to bring the elevator up and down. By us9ing pulleys it increases the amount of force put on the elevator cables .
4: I learned that even though one ramp is steep and another is more gradual, a ball coming down the ramp will end up being the same speed.
5: How do those t-shirts that change colors in the sun work?

lecture preflight 09
1: beause since w=f x D, a longer hangle will give you a longer distance which in turn will decrease the force..?
2: he'd need quite a long lever..
3: 1)mechanical pencil.. has a string that pushes down on the lead to make the lead come out 2)fan..blows cool air and releases warm air from the back
4: that our group could win a competition!
5: why does hair frizz

lecture preflight 09
1: Since the distance is increasing, the amount of force necessary to pull out the nail would decrease.
2: Yes, if the lever is long enough the force necessary to move the earth could possibly be small enough that he could move the earth.
3: The string on blinds is a pulley. A ramp leading up to a building would be an inclined plane.
4: I was sick so I was not in lab this week.
5: What makes static electricity?

lecture preflight 09
1: Because Work=Force*distance so if you are applying the same force when taking out the nail, the only way to increase the work is by increasing the distance. Therefore, using a long handle compared to using a hammer with a short handle.
2: No, because he would need a really really long lever and that would never be possible since the distance he would stand to the earth would never be measurable. Also, his mass compared to the earth's mass is practically negligible.
3: We use simple machines such as turning on a faucet or opening a door knob. Turning on a faucet is a simple machine that uses torque to be rotated and the door knob is the same concept. The amount of Force times the distance you rotate it creates the work necessary to move the item.
4: I learned that the more loops used in a pulley, the easier it is to lift something.
5: Why did the paper not break and the lever did when we did that bonus experiment?

lecture preflight 09
1: It is easier because you have to apply less force to the hammer with a long handle. According to W=F*d, we can see that when distance is greater, you apply less force for work to be done.
2: No this does not make sense because in order to move the earth, he would have to get a lever that is larger than the diameter of earth. Also, his mass would be begligible next to Earth's mass and therefore, it would be impossible for him to move the earth by just using a lever.
3: First, a water faucet is a simple machine. The way they work is that inside a pipe, there is a small piece of metal which is blocking the water going through when the water is off. As soon as you turn the knob, this metal piece moves and allows water to pass through. Another is a door knob. Its a rotational simple machine.
4: I thought it was interesting to design a pulley in lab and then measure how much force we are applying to lift the water bucket.
5: After being out in the sun for a while, you decide to go indoors. At this point, why does everything appear to look so dark?

lecture preflight 09
1: because with the longer handle there is more leverage on the handle and more force that can take the nail out.
2: yes, we showed in class that we can do this with weights
3: stairs (inclined planes) blinds (pulleys)
4: how to use pulleys to raise a bucket of water
5: why do worms re grow when you cut them

lecture preflight 09
1: You get more torque out of the long handle, just like it is easier to balance the board when the fulcrum is closer to the heavy end.
2: Yes. If the lever was truly long enough, and he could stand somewhere, he would be able to move it, however he would need to be in a different galaxy.
3: Elevators use pulleys. Also, the well on my farm uses a pulley to bring the water up.
4: Mass does not matter when you roll a ball down a board, the speed is the same due to distance.
5: Why is it so warm today, and yet going to be so cold tomorrow?

lecture preflight 09
1: With a longer handle, you are able to put more pressure on the hammer, thus creating more force to pull the nail out.
2: Wouldn't he need a fulcrum?
3:
4:
5:

lecture preflight 09
1: the long haddle gives you more leverage. the distance is longer so the force will be less.
2: yes because as long as there is enough leverage (a long enough lever) and a fulcrom close to the earth, it would take not very much force to lift the earth.
3: elevator, ramp
4: i learned about the direct relationship between force and distance
5: why does gravity work? what is pulling us down?

lecture preflight 09
1: It will be easier because the distance is longer and the load will seem smaller so it will be easier to pull out.
2: This makes sense because with the longer lever there will be more distance so the load of the earth will seem smaller. At the same time though, the same amount of energy will be used so I do not know if this is really possible.
3: One simple machine is the wheel like with a bicycle, because it rotates at a middle point that causes the movement. Another simple machine is a door knob. The door knob works by turning the knob which allows the stopper to get sucked in the door to open the door. By letting go of the knob when it's turned the stopper will come back out to secure the door closed.
4: One interesting thing I learned from lab was that the same amount of energy is used for a small load and a large distance and a large load and a small distance.
5: How does a scale work?

lecture preflight 09
1: Because the weight of the object times the height equals the work needed to remove the nail, if the hammer is longer it more than likely is heavier and therefore makes it easier to pull the nail out of the piece of wood if both the hammer and the piece of wood weight almost he same.
2: Yes, it actually does make sense because he is trying to explain that objects are in equilibrium at distances reciprocally proportional to their weights. So I guess, it means that if you stand at a specific distance proportional to the weight of the Earth, you can lift it up with a lever.
3: Two types of Machines that we use in our day to day lives are mechanical pencils and watches. Mechanical pencils work when you apply a certain amount of force to the top(eraser portion) of the pencil. Then, when you apply that force the inside portion of the pencil contracts adding pressure to a speicific spot. This spot then opens a tube looking like object that opens up and allows the lead to come down. A watch works because as the seconds handle moves it rotates the screws in the back which move the scews for the minute and hour handle.
4: One intresting thing that I learned this week in lab was that the work needed to move any object up to specific height is equal to the weight of the object times the height.
5: What is the Physics theory of attraction and how would you explain it to a third grader?

lecture preflight 09
1: Because you have to use less force to pull it out.
2: No it doesn't because the Earth is already moving.
3: 1)using levers to help move boxes. 2)using levers to move other things.
4: I learned a lot about force and levers.
5: How does an air conditioner work?

lecture preflight 09
1: leverage! piviot point, less force more distance
2: kinda but no because there is no pivot point
3: fan- spinning action causes wind. fridge-motor with collant causeing things to stay cold.
4: the way we used to two pulling to understand helping forces.
5: OK so we all know that there are some dumb laws that are in place and this is one of them "If one wishes to plant new sod in his or her yard in the summer months, that person may not use the city's water to water it" where is it from? Illinois* California Iowa Flordia

lecture preflight 09
1: The longer handle uses less force to pull a nail out of a piece of wood.
2: Yes, because levers move objects and that is what Archimedes was referring to. However, what he said is not possible because Archimedes is probably too light to move the earth.
3: Yes, I drive on ramps on the highway. This simple machine is a ramp and they work but increasing or decreasing in height in order to reach another height. I also use a pulley in order to move books up and down levels at work.
4: I learned that work is distance times force.
5: What causes lightning?

lecture preflight 09
1: Using a hammer with a long handle gives more leverage, making it easier to pull out a nail.
2: This does make sense but I give it a 99.99999999999999999999999999999999% chance of never happening.
3: I use many light switches. These are levers that activate a circuit that makes lights go on and off. I also use clocks. Clocks are gears that tell time.
4: Learned more about work (in terms of physics).
5: Why does a vehicle backfire?

lecture preflight 09
1: The longer the distance, the less force is required to equal the same amound of work.
2: No, because there is no gravity in the atmosphere to weigh him down to push the earth up.
3: Ramp for the handicapped (although i do not need it, i still use it sometimes) is an inclined plane that allows those in wheelchairs to a. reach a higher level but b. do so with a lower amount of work. Elevators are on a pulley system where a motor pulls the string through pulleys in order to lift a heavy load such as the elevator.
4: A large basketball and a small racquetball have the same speed when traveling down a ramp.
5: What amount of force would cause a tree to become uprooted and then fall to lean on a building? Then, how do you calculate the force required to push that tree from the side of the building to land on top of my car? (This really happened)

lecture preflight 09
1: The long handle allows for the same amount of work to be done but with less force. Work equals force times distance - the bigger the distance the smaller the force.
2: If gravity were not a factor than and a fulcrum could be created - this could be possible.
3: My trash can, I push down on the base of the trash can to open the top the the trash can - this works simliar to a lever system. Ramps on all buildlings. The ramp allows me to cover the same amount of verticle distance with out having to directly vertically raise my leg.
4: Regardless on incline objects move at the same speed.
5: What conditions percipitate a tornado? (air pressure, temp, etc).

lecture preflight 09
1: It requires less work to pull a nail out of a piece of wood using a hammer with a long handle because it requires less force with a longer distance.
2: Yes it does. In the equation work equals force times distance, if the distance is long enough then it does not require a great amount of force.
3: Opening a door is an example of a simple machine because it requires you to use force by either pushing or pulling. A pop can is also an example of a simple machine. Opening the can requires you to use force on the tab in order to release the pressure sealed in the can.
4: I thought it was interesting to learn that the weight of the ball doesn't affect the speed that it rolls down a ramp. Height is all that really matters.
5: What is fog?

lecture preflight 09
1: Because when the force is smaller, it takes longer to achieve your goal.
2: A little, because he could adjust the fulcrum to where he could move a really heavy object.
3: A hand-held can opener - lever Car jack, by applying force to one end, the other is lifted up.
4: No matter the ramp, the object will have the same speed.
5: How does a diamond form?

lecture preflight 09
1: You are exerting a smaller force over a longer distance.
2: This makes sense if you think of it like the activity we did in lab this week using levers to lift the washers. If the fulcrum is closer to the end under the earth, it would be easer to lift it using much less force.
3: 1. The gears on a bike mesh together when someone pedals to make the wheels move with the help of a chain. 2. Door stop-this is a triangular wedge that when placed under the door, keeps it from closing because it applies a force that is perpendicular to the surface.
4: How to make an effective pulley to lift 112 ounces of water with a force less than 20 newtons.
5: How does the internet work?