lecture preflight 07
1: If it is pulled on at a constant rate, the velocity and
acceleration are flat lines on a graph. Is that what this question
means?
2: The amount of mass makes the difference not the force.
3: Graphing the distance, velocity, and acceleration of something
thrown into the air was a great refresher. I could not remember how to
graph the acceleration for anything!
4: How did you discover that a broken light bulb could light up
in a microwave? Do you just experiment a lot or is there a web site that
lists these various ideas?
lecture preflight 07
1: Pulling on a skateboard with a constant force increases the
position, increases the velocity and keeps the acceleration the same.
2: Mass.
3: Flax cookies are a good source of Omega-3s.
4: How do clocks work? How do the gears continually move each
second?
lecture preflight 07
1: If you are pulling the skateboard at a constand speed, the
position is definitely changing. The velocity and acceleration are
increasing.
2: I think this is because in order for something to move, one of
the forces must be acting more or greater on an oject. For instance, a
table is being affected by gravity and a normal force that are equal,
because it is stationary. However if someone were to start to push it,
that push is a new force. It has an opposite (friction), but it is
smaller if the table moves.
3: I relearned that the force of gravity is 9.8 m/s squared. I
also learned that force is measured in Newtons.
4: Does coffee or caffiene always make you awake? People always
tell me that, but I don't think it affects me. I consume alot of
caffiene usually, so I was thinking I'm immuned to it.
lecture preflight 07
1: the position of the skateboard is getting further away from
start and the velocity is increasing and the acceleration is constant
2: Because they are acting in opposing directions, on different
things. When we used the skateboard and pushed off the wall, one force
acted on us, and the other on the wall.
3: -that acceleration of a falling object is always negative
-that a rocket has to fire backwards to stop
4: 1. how does carbonation in pop work? 2. what are all the
contraptions in the lecture room on the walls?
lecture preflight 07
1: if you pull with a constant force then the velocity and
acceleration remains the same, while the skateboard is moving in the
direction that it is being pulled.
2: things don't move unless an applied force is present.
3: how forces such as gravity and friction can impact the
acceleration of an object.
4:
lecture preflight 07
1: The position increases because there is a velocity being
applied. The velocity remains constant. The acceleration is zero.
2: Because gravity acts upon both forces.
3: I'm no good at riding skateboards.
4: What causes lightning?
lecture preflight 07
1:
2: Well there is other factors that go into it. For example
hitting the skateboard against the wall propelled a person backward.
This was because the wall is much more massive. For this reason the
3: I learned how to graph accerleration.
4: How does a video tape or DVd work?
lecture preflight 07
1: Position moves, velocity is constant (always moving in same
direction, same speed), acceleration is constant, unchanging.
2: Because some things have more mass than others. Yeah, I push
the wall, but it is so massive that my minimal force exuded on it is so
slight compared to its mass so I move instead.
3: I'm terrible at skateboarding! Also, I believe everyone knows
the answers to lab questions but no one raises their hands and class
would move a lot faster if everyone participated. I don't have a
solution, but I thought I'd make note of my observations...
4: What is 'biltong'? An alcoholic beverage A European dance
Strips of dried salted meat A type of music (answer: strips of dried,
salted meat)
lecture preflight 07
1: If you pull on a skateboard with a constant force, the
positition, velocity and acceleration would all change positively.
2: The forces do not cancel out because the object with the
smaller mass received the equal force and is moved.
3: I learned that the initial force to move something is greater
than the force it takes to keep it moving. This was demonstrated with
the spring scale and the block of wood sliding across the table.
4: How does advil work?
lecture preflight 07
1: the position increases, velocity increases and acceleration
will remain constant if it is pulled with a constant force.
2: Equal and opposite forces allow for movement. When someone
pushes the skateboard the the pushing force is too great for the
skateboard to remain stationary so it moves to equalize the force from
the pull.
3: i learned more about forces
4: why arn't people's faces symmetrical?
lecture preflight 07
1: On our skateboard, the longer the skateboard was pulled the
faster it went.
2: Because they are all working together
3: friction keeps us from floating around
4: what makes markers juicy?
lecture preflight 07
1: The acceleration of an object is the change in velocity.
Therefore, if you double the force applied, the accleration of the
object will double. And also, if you double the mass load of the object,
the acceleration will not be as fast and be cut in half.
2: As you push a skateboard with someone on it, you have to think
about all the forces acting. There is the force of the push and a force
pishing back (friction). There is also gravity and normal force.
3: I found the concept of normal force to be interesting. I
thought it was amazing that there is this unseen struggle between
gravity and normal force that cancle each other out and keeps thing from
flying all over the place.
4: Why does the mean have no atmoshpere?
lecture preflight 07
1: If you pull on the skateboard with a constant force, the
acceleration stays constant, the velocity increases positively at first
and then remains constant, and the position continues to increase as the
skateboard travels more distance.
2: Because mass has an impact on this. If one object has more
mass than another, than the one with less mass will have a more visible
reaction/will accelerate. A good example of this is when we sat on the
skateboards and pushed off the wall. Since the wall has greater mass, it
did not move; it takes more force to make it move than us just pushing
off of it. We, on the other hand, moved significantly.
3: I learned Newton's three laws. Also, I learned that when a car
slams on its brakes and you fling forward it's because you continue to
move when the car stops (objects in motion stay in motion...) and its
not because a force is pushing you forward.
4: How do lightbulbs work? What inside them make some brighter
than others?
lecture preflight 07
1: The position changes because the skateboard is traveling, it
travels a distance. The velocity is positive because you are traveling
forwards and also since you are pulling on it with a constant force the
velocity would stay the same. Also the acceleration would stay constant.
2: Although the forces may be equal the mass of the objects
exerting the force and this causes the objects to move. An example would
be rolling a skateboard into a wall. The skateboard and the wall exert
the same pressure on each other but since the skateboard has less mass
it is efffected by the force.
3: I learned the difference between velocity and acceleration.
4: How is ligthening formed?
lecture preflight 07
1: The position of the skateboard moves forward, the velocity is
constant while the acceleration is changing.
2: Yes, this is true but things move because of the mass is
different. When we pushed the wall we moved back but the wall did not
move; same forces, different masses.
3: I re-learned about the different graphs of distance, velocity,
and acceleration.
4: How come the weather is constantly changing from beautiful,
today (Tuesday) back to cold again this weekend?
lecture preflight 07
1: it will increase in position but velocity will chage and acc
will be constant
2: because of the diff amt of force
3: skateboards
4: how would the skateboards be diff on ice?
lecture preflight 07
1: The position moves horizontally when it is being pulled at a
constant force. The velocity remains positive because the skateboard
never goes backwards, and the acceleration remains constant as well
because it is being pulled at a constant force. Therefore it isn't
speeding up or slowing down.
2: Because of the mass. The last experiment when we had to push
off the wall demonstrated that because the wall is massive (in weight)
it won't move. Therefore, only the person pushing off the wall will
move.
3: That skateboards are hard to ride on
4: Why are some pills HUGE? I feel like I'm going to choke on
them when I take it! Can't they make the pills smaller and tell
customers to take 2?
lecture preflight 07
1: When you pull with a constant force the skateboard moves
forward. The board moves forward at a constant rate, that which you are
pulling. The acceleration of the board is zero because there is no
change in velocity.
2: There can be a difference in other things such as angle of
contact, friction, or material. I can hit a wall and the wall hits back
at the same force, buti will fall down and the wall wont.
3: When you throw something up in the air, at the top of the arc,
it has am acceleration of -9.8 even though the velocity is zero.
4: Why does everything mixed together to form concrete hold so
stongly?
lecture preflight 07
1: The position changes in that it has a further distance for
each second. The velocity increases constantly. The acceleration is
constant.
2: Because masses differ.
3: That velocity is a derivitive of distance, and acceleration is
a derivitive of velocity.
4: What is the acceleration on the moon?
lecture preflight 07
1: The position changes in regards to where youare when you're
being pulled. The velocity speeds up at first, and then becomes
constant. The acceleration is fast at first and then also becomes
constant.
2: Because not all things are connected to the earth. For
example, a wall won't move because it's connected to the building which
is connected to the earth. However if something with a bigger force (a
truck) hits it, it will move.
3: I would've never guessed that the velocity graph would be a
straight line on an angle like that.
4: how does a spaceship break through the graviatational force
and get into space?
lecture preflight 07
1: If you pulled on the skateboard with a constant force the
position of the board would change yet their would be no accelearation
and the velocity would be constant.
2: The reason why the forces don t always cancel each other out
depends upon acceleartaion and the way in which the active participant
moves upon the forces.
3: The most interesting thing I learned in lab this week is that
forces are equal and come pairs. I first thought that our force against
the wall was greater than the wall s force upon us.
4: What makes the wind pick up speed when it s blowing?
lecture preflight 07
1: The skateboard moves forward in the direction you pull it. The
velocity increases and the acceleration increases in proportion to the
mass.
2: You have to factor in the mass of something, which will tell
you how much these forces affect the object.
3: I learned why we can't move walls.
4: Have you heard of the Mentos and Diet Coke experiment? It was
really popular on YouTube a while ago. How does that work?
lecture preflight 07
1: The position of the skateboard will move in the direction of
the pulling force, velocity will remain constant, and acceleration will
be zero.
2: This is true because the mass times acceleration of the first
object is equal to the mass times acceleration of the second item. If
equal force is applied to both objects then the object with the smaller
mass will experience a greater acceleration.
3: I learned how to measure friction as a force.
4: How do clocks change on their own when daylight savings time
occurs.
lecture preflight 07
1: When pulling on a skateboard with a constant force the
position will change as you cover ground, the velocity will remain
constant while the acceleration will stay at 0.
2: This is true because friction is involved allowing objects to
move with a force for a certain amount of time but will eventually stop
due to the opposing force.
3: No matter what objects you are considering there is always a
gravitational force acting on it and a normal force acting on it.
4: How do cell phone chargers charge phones?
lecture preflight 07
1: position increases, velocity is at a constant acceleration
should be zero because the speed is not changing when it is being pulled
at a constant force.
2: because some forces are stronger than others, and that is why
people can lift their arm through the air w/o a problem.
3: there are such things as fake Oreo's
4: who is daylight savings time determined?
lecture preflight 07
1: The position of the skateboard is increasing in distance. The
velocity is constant and the acceleation of the skateboard is zero.
2: The force and mass of one object is greater than the opposite
force.
3: I thought it was interesting that if you throw a ball up into
the air, the highest point is not zero but has an accerleration.
4:
lecture preflight 07
1: The physical position changes because you are moving it from
one location to another. The acceleration shouldn't change if you are
pulling at it with a constant force. The velocity would change as it is
also dependent upon location.
2: Because when the force applied is greater than the forces
acting against it, the object will move (ie; when you throw a ball into
the air and it eventually comes down, this is because the force of
gravity has overcome the force with which you threw the ball)
3: I had no clue about those velocity, acceleration, etc. graphs
before class
4: Is it true that some forms of air freshener really get rid of
bad smells entirely? Or do they really mask them? If it really gets rid
of bad scents, how does this happen?
lecture preflight 07
1: The skateboard moves all the floor and the acceleration
decreases with more mass. Velocity changes.
2: because of a little thing called mass. our mass is small
compared to the wall so we move.
3: I learned that are 2 different types of acceleration.
4: Why did we change our clocks ahead 1 week earlier this
weekend?
lecture preflight 07
1: The position changes, the velocity increases and the
acceleration is constant.
2: The force's impact depends on the mass of an object. (F=ma) If
an object has more mass, it will have less or no acceleration.
3: Understanding the differences of velocity, acceleration and
distance.
4: How/why does the earth have magnetic poles? What does this do?
lecture preflight 07
1: If you pull at a constant force, then the velocity remains at
a constant slope, and if veloicity is at a constant slope then
acceleration is also constant and doesn't change over time.
2: Since acceleration equals force over mass, force must be
greater than mass for acceleration to occur. There are multiple forces
acting upon an object at many times, and a force greater than all the
other forces can cause acceleration.
3: Net (total) force, and how forces are able to cancel each
other out so our net force is zero. For example, gravity is one force
acting upon us, but the floor pushing up on us is another force that
cancels gravity's force out, making a person motionless.
4: How do glasses/contacts work to correct our vision?
lecture preflight 07
1: The skateboard increases in acceleration as its speed
increases. The position overall of the board changes because it goes
from one location to another. The velocity increases and decreases
depending on the direction and overall speed.
2: Just because we have different forces and different reactions
to force does not mean that they occur at the same time and thus would
have to cancel each other out. They may not occur simultaneously, and
thus not cancel each other out completely.
3: I learned that velocity and acceleration are two separate
forces.
4: How do you calculate the velocity of a Jet Plane ?
lecture preflight 07
1: If you pull with a constant force as we ddid in lab this week,
acceleration will be zero, velocity will be constant, and the position
will be changing at a constant rate.
2: Because the objects are different. and as long as something is
moving to start the reaction, the energy that was associated with that
object moving will have to be converted into something else, for
instance the other object moving, both objects moving, or another type
of energy.
3: it is fairly simple to derive Neuton's equation of F=ma
4: what makes one guitar better than another.
lecture preflight 07
1: The acceleration will change depending on the force of the
object on the skateboard. We learned in lab that it is harder to get
something that is heavier to start moving fast.
2: The forces do not cancel each other out because there are more
factors that are part of it. For example, when we pushed ourselves away
from the wall on the skateboard, we moved and the wall stayed because
our mass is much smaller than the mass of the wall. Force, mass and
acceleration all play a role in whether or not something will move.
3: I thought it was interested how easily Newton's Laws can all
be intertwined and used to explain one another.
4: How is heat lightning formed? Is it equally as dangerous as
the lightning that occurs during a thunderstorm?
lecture preflight 07
1: The position is changing since the skateboard is being pulled
on with a constant force, but the velocity is constant since there is a
constant force of pulling on it. Since the velocity is constant, the
acceleration is zero.
2: Equal and opposite forces do cancel out technically, but just
because something is moving doesnt mean there arent equal and opposite
forces acting on it. As we saw in class with pushing against a wall
while sitting on a skateboard, the wall didnt move because it had a
larger mass than the person, who moved backwards with a force equal to
that that the wall has. Everything moves with a force, and just as
objects at rest have equal forces acting upon them, so do moving
objects. The forces can be pushes, pulls, friction, gravity, etc., all
causing equal and opposite reactions for every action.
3: I thought it was interesting when we used the spring to see
that it took more Newtons to move two people on a skateboard than one. I
wouldve assumed that it took a larger force, but it was neat to actually
see that force measured.
4: How come if you blow out a fuse with something like a blow
dryer, you can just reset it and it suddenly works again? Wouldnt it be
broken and youd have to get a new "fuse"?
lecture preflight 07
1: if you pull on the skateboard with a constant force the
velocity stays the same as does the acceleration unless you pull with a
stronger force. If you increase the force than it goes faster but if you
increase the mass on the skateboard then you go slower.
2: Because the rest of the saying is unless it is acted upon by
another force. So if something with a stronger force against a weaker
one it will cause an object to move.
3: There is still acceleration even when the velocity of the
object is at zero.
4: what causes wind and why is it stronger in certain areas?
lecture preflight 07
1: The position increases, the velocity is positively increasing,
and the acceleration is equal to the slope of the line (positive) of the
velocity.
2: One of the objects that is exerting a force may have a much
greater force than the other one (ie the wall had a much greater mass
than the person on the skateboard)
3: I think it was really interesting to learn that if there was
no friction, if you ever started walking, your feet wouldn't be able to
stop moving.
4: How does your body produce sweat?
lecture preflight 07
1: The skateboard will move in the direction you pull on it. The
velocity and acceleration will change at a constant rate.
2: Because some forces are bigger than other ones (like the
person pushing off of a wall), and the only "opposite" force we see in
the person moving backwards.
3: I learned how to use a spring scale to meausure the force of
an object.
4: Why do our stomachs' growl?
lecture preflight 07
1: The velocity stays constant as does the acceleration when
pulling on a skateboard with a constant force. The position that one
ends up in is related to how much force and how much mass is on the
skateboard.
2: Because mass and acceleration need are involved too and if two
things do not have the same mass there will not be a cancellation.
3: Acceleration is constant if the velocity is linear.
4: How do waves form in the ocean?
lecture preflight 07
1: If you pull the skateboard with a constant force, its position
will change at a constant velocity. The skateboard will accelerate as it
starts and have no acceleration as it is gliding.
2: When a greater force is applied in one direction, it causes
the object to move. The opposite force eventually makes the object come
to a stop.
3: When something is moving a constant velocity with no
acceleration then there is no net force on the object.
4: How does Tylenol work to cure pains such as headaches?
lecture preflight 07
1: If you pull on the rope with a constant force so that the
skateboard changes, the skateboard goes forward in a positive direction
at a constant rate. In addition, the acceleration increases at a
constant force that is proportional to the weight being pulled.
2: The reason why we moved backward from the wall wasn't because
of inequality of forces, but rather the consideration of mass in the
equation. The mass of the wall was greater than the mass of you;
therefore, you moved backward while the wall stood stationary. Thus,
lets consider the equation acceleration equals f/m as well!
3: How to ride a skate board!
4: Why does fat taste so good?! What is fat composed of?
lecture preflight 07
1: The acceleration would be constant since the skateboard is
going at a constant force and velocity would be positive.
2: External forces overcomes it in one direction.
3: If both velocity and acceleration were 0 when an object is
thrown into the air, then the object would just be hovering at the top.
4: Why is well water so bad for you?
lecture preflight 07
1: Your position moves forward. Your velocity and acceleration
are positive.
2: other factors in the environment such as friction.
3: I am really bad at physics. I learned that no matter how many
times I learn about
4: How are we able to chew on gum for so long without it
dissintegrating?
lecture preflight 07
1: position is increasing in distance. Velocity is constant.
Acceleration is zero.
2: Because the masses are different in varying objects.
3: The reason why the earth doesn't move when we try to push it
is b/c the earth is so much heavier than us.
4: Do those cell phone extended range stickers (to give you
better reception) really work??? what is it based one?
lecture preflight 07
1: Position will change because you are pulling the skateboard
forward. The velocity will increase and then decrease. The acceleration
would increase at a rate depending on the mass of the object.
2: For an object to move, one of the forces has to be stronger
than the other. For example, a table on the ground is does not move
because the floor is able to push up the same amount of force as its
mass. However, if you put the table on hammock, the hammock would move
downward because the force of gravity is greater than the natural force
it can provide.
3: I did not know that it is possible to pull something at a
constant force.
4: How do geysers work?
lecture preflight 07
1: position moves in space, velocity speeds up and then slows
down, same with acceleration
2: because we exert energy to move through space
3: acceleteration does not equal velocity
4: How do thermometers work?
lecture preflight 07
1: position changes, but velocity and acceleration are constant.
2: The more mass an object has, the more force is needed to move
that object. Because those equal and opposite forces are what cause
either motion or no motion (standing still). When paired together, they
cant cancel...they together are what cause motion or no motion.
3: The definition of Newton's 3 laws.
4: How, chemically, are artificial flavors made? They taste so
much like the real thing!! (Strawberries for example)
lecture preflight 07
1: If you keep the force constant, the acceleration and velocity
will also be constant. The position does change from zero and increases,
too.
2: The opposite forces act in opposite directions. They also
initially act at a different time so they start differently.
3: I really thought the skateboard pulling lab was interesting. I
was surprised the results in our class all basically followed exactly
what it was supposed to be (the lighter load goes farther, etc.).
4: Is there some kind of chemical in a banana that gives you
energy?
lecture preflight 07
1: position changes exponentially, velovity changes constantlty
acceleration is the same
2: it depends which side has more inertia
3: fat free cookies don't taste good
4: how long do trees live?
lecture preflight 07
1: If there is a constant force being applied, then the object's
position is constantly changing. The velocity is also constant, which
means that there is no acceleration.
2: Some forces have greater masses than others. For instance, we
couldn't move the wall becuase of its huge mass, even though the forces
applied by the person and the wall were both equal and in the opposite
direction.
3: I learned more about how to apply Newton's third law.
4: How do you put backspin on a golf ball?
lecture preflight 07
1: Depending on how much weight is put on the skate board is how
fast the the velocity and acceleration will be. The more force put on
it, the higher the velocity and acceleration will be.
2: The reason why the equal and opposite forces do not cancel out
is because the have an extra force excerted on them from the force
pushing it which allows it to move.
3: Gravity influnces acceleartion and velocity. I had never
really thought about this although it seems like it should be common
sense
4: Who was the first scientist?
lecture preflight 07
1: The position of the skateboard changes because the skateboard
is moving, the velocity is constant and postive, and the acceleration is
constant because the force is constant.
2: Even though the forces are equal the objects exerting forces
on each other do not have equal masses, like how if you push on a wall
the wall does not move but you move backwards.
3: I learned that the force that cancels out gravity is called
the normal force.
4: How does the telephone work?
lecture preflight 07
1: The position of the skateboard moves in the direction it is
being pulled. The velocity is the displacement over time. The
acceleration is constant until the force stops pulling on the
skateboard, and then friction slows it down until it finally stops.
2: The equal and opposite recations are not the only forces
involved. There are other forces that are involved in all force
situations, such as gravity and the upward force.
3: There is an upward force that cancels out the pull that
gravity has on us.
4: Why could I feel the sun more present on my skin this week?
Does that mean that my distance from the sun is actually closer?
lecture preflight 07
1: If you pull on a skateboard with constant force, it will move
forward so it's velocity and acceleration will be positive.
2: Even though the forces may be equal, the mass of the objects
determines what moves and what doesn't. A force may not be able to move
a wall, but it will move a person.
3: I learned that acceleration is negative when an object is
falling.
4: How are batteries recycled?
lecture preflight 07
1: The position will move, the velocity will increase at first,
the acceleration will increase quickly at first then come to a constant
rate.
2: At one point in time there can be an unequal amount of forces
for one side.
3: How velocity and acceleration aren't the same thing, and
velocity must include speed and direction.
4: How do people manipulate the flavor of the same beans to make
both chocolate and coffee?
lecture preflight 07
1: The acceleration increases as you pull the skateboard with a
constant force. The more force that you use, the greater the distance
the skateboard travels. In terms of velocity, the distance that an
object travels is equal to its velocity x time. This is related to the
other variables, acceleration and time, because the distance that the
skateboard went is equal to 1/2 the skateboard's acceleration x the time
it traveled squared.
2: As in the example with shoving the wall, the wall didn't move
and I did. This is because the force of the wall is attached to the
building, which is essentially attached to the Earth, and the Earth
obviously has a much greater mass than I do. Essentially, equal and
opposite forces do not cancel each other out because of differences in
mass.
3: In the skateboarding part of lab, I learned that in order to
maintain a constant force, you have to accelerate.
4: Why is Champaign/Urbana so windy?
lecture preflight 07
1: Position changes in the positive direction. Velocity
increases. Acceleration remains the same.
2: f=ma. something with a larger mass has a larger inertia and
doesn't move as much by a force exerted on it. for example. If i jump on
off the ground, I'm exerting the same force on the earth as it is on me,
but because the earth is so much larger than me, it doesn't move very
much at all.
3: Skateboards are cool.
4: how does a governor on a car work.
lecture preflight 07
1: If you pull on a skateboard with a constant force, then the
position moves. However, the velocity and acceleration remain constant.
2: I think it has to do with the different masses. If an object
has a smaller mass, it will move. For example, when we pushed off the
wall with the skateboard, the skateboard moved backwards but the wall
did not. This was because the wall was much more massive than the
skateboard.
3: I learned that there is always a normal force acting on an
object, even if it is not moving.
4: Why did time change earlier this year?
lecture preflight 07
1: The skate board will move in position because of the force.
Its velocity will change with a constant acceleration.
2: Because although objects have the same force they have
different inertia.
3: a constant force causes and object to accelerate.
4: How do planes fly?
lecture preflight 07
1: The more mass an object has, the more force is needed to move
that object.
2: Because those forces are what causes motion or standing still.
there are always forces acting upon every object to allow it to do what
it is doing.
3: I learned that Newtons 3rd Law is like Kissing!!! :)
4: Does sleeping after a meal lead to weight gain?
lecture preflight 07
1: the skateboard will travel further depending on the amount of
force used to pull it. If the force is doubled, but the mass of the
skateboard is the same, then the velocity and acceleration will
increase, and the skateboard will travel twice as far. If the mass of
the skateboard is doubled, but the force is the same, then the velocity
and acceleration will decrease and the skateboard will travel half as
far.
2: because of the intensity of the initial force. If you push
yourself on a skateboard off a wall, you will move because the initial
force off the wall makes you travel backwards. However with friction
force, you will slow down and eventually stop. This is why each force
has a reaction force, but given the time, it will cancel each other out.
3: I always thought at the very top, when a ball is thrown into
the air, that acceleration was zero, but after this weeks lab I realized
it's negative b/cuz it is moving downwards, otherwise it would just stay
there and never move.
4: Why does the sky turn red before the sun goes down?
lecture preflight 07
1: It goes faster if you double the force. If you double the
mass, it goes slower.
2: Initial force is greater, so you move, but eventually friction
slows you down, and cancels out
3: Springs and how they move
4:
lecture preflight 07
1: position, velocity, and acceleration will all increase in a
constant manner when pulled with a constant force
2: because the masses are different. if the masses were the same
they would cancel each other out.
3: Newton's third law
4: what is the difference between parallel and series circuits
lecture preflight 07
1: The position of the skateboard will move forward while there
is a positive velocity and a constant acceleration.
2: I believe that this has to do with an object's mass. For
example, when I sat on a skateboard and pushed myself off of a wall I
moved and the wall did not. Because the wall has a much greater mass
than myself, it did not move. I however went rolling backwards because
the force from the wall was equal to the force of my push off of it.
3: Acceleration can be constant. I always thought by defenition,
acceleration always had to have a positive increase.
4: What is the formula for finding one's body fat? Also, why is
it most accurately taken under water? How does that work?
lecture preflight 07
1: position changes in a positive direction, velocity stays
constant, and there is no acceleration.
2: because the masses of objects are different therefore some
things can move and others do not like a wall vs. a skateboard.
3: I learned about the normal force and how it cancels out the
force of gravity.
4: Why do we sleep?
lecture preflight 07
1: If you double the force, then you double the acceleration.
acceleraction is equal to force divided by mass.
2: Because if the object has less mass, it is not going to have
as much force. for instance, when we pushed the skateboard off the wall,
our mass was much smaller, therefore, we fall back when we push on it.
3: I learned that a ball decreases in acceleration as it in going
up in the air and increases when it is going down.
4: I was wondering how computers are able to access the internet.
lecture preflight 07
1: The position would move in a positive or negative direction,
the velocity would be constant but positive, and there would be no
acceleration.
2: If you only had one force, you would never be able to stop
moving. If you have 2 forces then it equal eachother out. You need a
force that moves and one that does not move in order to cause an object
to stop when needed.
3: I learned that it is difficult to balance two people on a
skateboard.
4: How do neon lights work?
lecture preflight 07
1: the position of the skateboard increases however far you pull
it. the velocity of the skateboard decreases until it is negative
(graphed as a straight line with a negative slope). the acceleration is
a constant (graphed as a straight line).
2: Because extra forces are exerted on objects to make them move.
When an object is stationary, the paired forces do cancel each other
out.
3: I learned how to crash into a wall on a skateboard and i was
reminded about the coefficient of gravity. :)
4: How do you program a magnetic strip?
lecture preflight 07
1: the position changes because you are physically moving the
skateboard, the velocity remains the same, as well as the acceleration,
because you are using a constant force
2: masses of the objects are different
3: i learned that i am not coordinated enough to be pulled on a
skateboard :)
4: how do planes stay in flight?
lecture preflight 07
1: Position-skateboard moves forward Velocity-the speed and
direction move forward at a constant pace and one direction
Acceleration-positive because the skateboard is being pulled forward at
a constant rate
2: Because forces act upon them; some are stronger than others.
3: I re-learned that normal force is what acts against gravity to
keep us stable, more or less.
4: How do so many songs or 6 episodes of a TV show fit on one
little CD or DVD?
lecture preflight 07
1: You move at a constant velocity and there is no acceleration
after the original start. The position is directly related to the amount
of time that you are being pulled at this constant force.
2: Things move when the mass between these two things are
different. Then the item with less mass moves.
3: I learned that even though it is really small and cannot be
measured, we push on the Earth and actually move it.
4: Why is there a lot of static electricity in the winter?
lecture preflight 07
1: if you use a constant force, then the position change will be
greater if there is a smaller mass on the skateboard. with a constant
force the velocity will remain constant, and if you have the same mass
on the skateboard then with a constant force the acceleration should
stay constant increase
2: there can be more than 2 forces acting on an object.. with the
skateboard when we pushed off of the wall, there was the force of
gravity (down) and the force of the floor (up) but also the force of the
push which was greater than the force of friction against the wheels so
we moved backward
3: the relationships between the different graphs of D vs T, V vs
T, and A vs T
4: why are some medicine tablets liquid and others arent..is
there a benefit?
lecture preflight 07
1: While the position changes, the velocity and acceleration stay
the same.
2: The mass of the objects are different, so the acceleration
will be different. Since the acceleration changes, objects move.
3: I thought that the acceleration would be zero when an object
thrown into the air was at its peak, but I learned that is not the case.
4: How can the temperature be 70 degrees one day and 30 degrees
two days later?
lecture preflight 07
1: The position of the skateboard will change as the skateboard
moves. The velocity will also be constant. Since a constant force is
applied, the acceleration will be zero.
2: The equal and opposite forces only allow the object to remain
stable when there are no other forces acting on it. Newton's third law
holds true on stationary objects, but if other forces' are greater, the
object will be able to move.
3: I thought re-learning the graphs of how the distance,
velocity, and acceleration are related was a good refresher of memory.
4: What causes skin pigmentation, especially when you go tanning?
lecture preflight 07
1: The more velocity and faster the acceleration, the further the
distance the skateboard travels.
2: Because the amount of mass and force are different for the
objects- such as when a human pushed the wall and only the human moved.
3: I learned that the velocity graph is the derivative of the
time vs. distance graph and the acceleration graph is the derivative of
the velocity graph.
4:
lecture preflight 07
1: the acceleration is unchanged.. the position of the skateboard
moves forward and the velocity is constant
2: some objects have more force exerted on it than others do
3: having two people on a skateboard the distance traveled is a
lot less than with only one person
4: what makes up dust?
lecture preflight 07
1: The position of the skateboard will move in whichever
direction you pull it, the velocity will increase in the direction you
pull it, and the acceleration will be constant.
2: Because it is possible for one to be stronger than the other.
For example, when you throw a ball up, neither friction nor gravity is
stronger than the force you put on the ball.
3: When two people are on a skateboard, it is much harder not
only to have a force pull them but also to steer.
4: How is it so warm today and supposed to be so cold again
tomorrow
lecture preflight 07
1: The acceleration increases as you try to pull the skateboard
with a constant force. The more force you use, the further the
skateboard goes. In terms of velocity, the distance that an object
travels is equal to its velocity times time. This is related to the
other variables, acceleration and time, because the distance that the
skateboard went is equal to 1/2 the skateboards acceleration times the
time it travels.
2: As we learned in lab, if you shove a wall, the wall will not
move but I will. This happens because not only is the wall attached to
the building, it is also attached to the ground/earth. In addition, the
wall has way more mass than I do. Equal and opposite forces don't cancel
each other out because of these differences in mass.
3: To keep a constant force when pulling an object, you must
continually accelerate.
4: Why is Champaign so windy?!!!
lecture preflight 07
1: If you pull on the skateboard with a constant force the
skateboard will change position with a constant velocity and
acceleration.
2: for something to move, one force must be greater than the
force acting against it.
3: i relearned alot of principles i had learned (but forgotten)
in high school. for example, learning the characteristics of force, mass
and acceleration and their relationships with eachother eas interesting.
4: i understand how gravity works, but WHY does it work? what is
actually pulling us?
lecture preflight 07
1: With a constant force, the more weight on the skateboard then
the slower the acceleration. The less weight on the skateboard then the
faster the acceleration. Also, if there is more weight on the skateboard
you will not travel as far as if there were less weight on the
skateboard for the same amount of time. Therefore with more weight on
the skateboard you will travel less meters/second so your velocity will
be slower. With less weight on the skateboard, you will travel more
meters/second so your velocity will be higher.
2: Equal and opposite forces do not just cancel each other out
and nothing ever moves because force also depends on mass of objects.
The more mass an object has then it will also have more force which
causes movement.
3: I learned that the velocity curve for a ball being thrown in
the air is a straight line going through the origin that has a negative
slope.
4: What makes gum stay as one piece when chewing it?
lecture preflight 07
1: The velocity, the acceleration, and the position of the
skateboard would remain the same at a constant force.
2: Equal and opposite forces don't just cancel each other out
because there are also other forces such as friction acting upon an
object.
3: One intresting thing I learned this week was that gravity and
normal force are opposites and this is the reason why things don't
float.
4: Is traveling in an airplane considered a form of time travel?
lecture preflight 07
1: Since you are pulling on it with a constant force, the
acceleration would be zero. The velocity would remain the same
throughout its movement, since the acceleration is zero. The position
depends on where you pull the skateboard.
2: They do cancel it out, causing things not to move. For
example, a desk has a force of gravity pushing down on it but at the
same time has a normal force of the same amount pushing up on it. That's
why the desk stays still.
3: My memory was refreshed of Newton's three laws.
4: How do ear plugs work?
lecture preflight 07
1: I think that the graph would be more of a straight line. it
really would not change and if there was no friction then it would coast
forever.
2: if we had this then car crashes would not be so severe, we
would be carefree.
3: that acceleration can be negative.
4: how can food be freeze dried, and still taste ok?
lecture preflight 07
1: The position of the skateboard is the direction the skateboard
is moving. The velocity of the skateboard is the constant speed in which
the skateboard is moving, and the acceleration of the skateboard is 0
because the velocity is not changing.
2: If the forces are equal on an object, the object does not
move. However, when there is added force to an object this causes the
objects to move.
3: I learned about Newton's three laws this week in lab.
4: Why are some light bulbs brighter than others?
lecture preflight 07
1: If a skateboard is pulled at a constant speed, then the
position will not be the same. The velocity will stay the same as long
as the skateboard is pulled in a straight line. The acceleration would
always be the same.
2: Some objects are able to move and others may not be moved
easily. I think friction has a lot to do with this question.
3: Pulling someone on a skateboard with a constant force is
harder than it seems.
4: Is it true that if I were to travel very deep into space I
would come back younger than when I left?
lecture preflight 07
1: If you pull on a skateboard with a constant force the position
is always increasing because the distance increases. The velocity is
constantly positive and the acceleration is zero.
2: Mass plays a major component in the equation. Smaller masses
experience a greater reaction.
3: There are two different kinds of friction: static and kinetic.
I thought there was only one type of friction.
4: How come in bowling it is better to hit the pins with a ball
that is curving rather than a straight on hit?
lecture preflight 07
1: The position will change as you cover ground, the velocity
will remaind constant as you will remain at a constant speed,
acceleration will be zero (no change in acceleration)
2: Because friction is involved and allow for movement and
stopping of movement.
3: That although it may not seem as though inanimate objects a
force (i.e. the wall on my legs) while I am exerting a force, they exert
an equal but opposite force.
4: How do computeres pick up wireless internet
lecture preflight 07
1: If you pull on the skateboard with a constant force the
skateboard will move across the floor, it's velocity will be positive
and it's acceleration starts at zero then continues to increase.
2: They don't cancel eachother out because one of the forces
overcomes the other force and is stronger. The outside force is more
powerful than the force acting against it.
3: I learned that everything has a normal force acting on it,
pushing up against gravity.
4: We were talking about magnetic poles in astronomy. How do the
magnetic poles switch places?
lecture preflight 07
1: When you have a constant velocity, force and acceleration are
equal. The heavier the object, the more force is needed to move it.
Also, acceleration equals force divided by mass. So when you pull on the
skateboard with a constant force, the skateboard moves and the distance
increases.
2: Because the masses are different, that is why we are pushed
back after hitting a wall, the wall's mass is much larger than ours.
3: I learned what normal force is.
4: How do calculators work?
lecture preflight 07
1: If you pull on a skateboard with a constant force, position
changes steadily, velocity remains constant, and acceleration remains
constant as well.
2: the objects have different masses, therefore they are
accelerating at different rates. there are also outside forces that are
at work such as as friction and air resistance.
3: I learned the relationship between force, mass and
acceleration.
4: Who was a better scientist, Newton or Einstein?