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18 Cards in this Set
- Front
- Back
distinguish between the relationship that defines acceleration that states how its produced |
a= force/mass |
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what is meant by the net force that acts on an object? |
the result of all applied forces. |
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suppose a cart is being moved by a certain net force if the net force is doubled how much does its acceleration change. |
it double the amount |
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suppose a cart is being moved by a certain net force if a load is dumped into it so the mass is doubled, by how much does the acceleration change? |
the cart will go slower than an empty cart. |
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distinguish between the concepts directly proportional and inversely proportional support your statement with examples. |
directly-increasing one variable increases the other.
inversely-one increase will decrease it. |
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state newton's second law in words and then in the form of a equation |
The acceleration produced by a net force on a object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.
acceleration= net force/mass |
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how much force does a 20 000-kg rocket develop to accelerate 1m/s squared |
20 000 newtons |
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what is the cause of friction, and in what direction does it act with respect to the motion of the sliding object |
surface irregularities |
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if the force of friction acting on a sliding crate is 100 N, how much force must be applied to maintain a constant velocity?what will be the net force acting on the crate? what will be the acceleration? |
100 newtons 0 net force 0 acceleration
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distinguish between force and pressure
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force nothing but push or pull
pressure just a force/area |
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which produces more pressure on the ground, a person standing up or the same person lying down. |
standing up |
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the force of gravity is twice as great on a 2-kg rock as on a 1-kg. Why does the 2-kg rock not fall with twice the acceleration |
twice the force acts on twice the mass |
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why do a coin and a feather in a vacuum tube fall with the same acceleration. |
both have the same weight to mass ratio |
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why do a coin and feather fall with different accelerations in the presence of air. |
(weight-rate/m ratios) |
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how much air resistance acts on a 100-N bag of nails that falls at its terminal speed |
100 newtons |
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how do air resistance and the weight of a falling object compare when terminal sped is reached |
air resistance =weight |
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all other things being equal, why does a heavy sky diver have a terminal speed greater than a light sky diver? what can be done so the terminal speeds are equal |
(air resistance/weight) is less ; varies the surface areas |
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what is the net force acting on a 25-N freely falling object what is the net force when the object encounters 15 N of air resistance when it falls fast enough to encounter 25 N of air resistane |
25-N downward and 10-n downward ;0 |