AP Physics C: Forces and Potential Energy
3.2. Forces and Potential Energy
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Question 1 of 18
1. Question
By what factor does the kinetic energy of a car change when its speed is tripled?
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Question 2 of 18
2. Question
Two stones, one twice the mass of the other, are dropped from a cliff. Just before hitting the ground, what is the kinetic energy of the heavy stone compared to the light one?
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Question 3 of 18
3. Question
You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on?
I) skier’s PE
II) skier’s change in PE
III) skier’s final KE
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Question 4 of 18
4. Question
Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?
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Question 5 of 18
5. Question
How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
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Question 6 of 18
6. Question
A truck, initially at rest, rolls down a frictionless hill and attains a speed v at the bottom. To achieve a speed 2v at the bottom, how many times higher must the hill be?
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Question 7 of 18
7. Question
Paul and Kathleen start from rest at the same time on frictionless water slides with different shapes. At the bottom, whose velocity is greater?
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Question 8 of 18
8. Question
You throw a ball straight up into the air. In addition to gravity, the ball feels a force due to air resistance. Compared to the time it takes the ball to go up, the time it takes to come back down is:
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Question 9 of 18
9. Question
When you pay the electric company by the kilowatthour, what are you actually paying for?
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Question 10 of 18
10. Question
A 15.0kg object is moved from a height of 7.00 m above a floor to a height of 15.0 m above the floor. What is the change in gravitational potential energy?
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Question 11 of 18
11. Question
A 400N box is pushed up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the push?
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Question 12 of 18
12. Question
A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cm?
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Question 13 of 18
13. Question
A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevation?
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Question 14 of 18
14. Question
A 1.0kg ball falls to the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it moving?
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Question 15 of 18
15. Question
A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its swing?
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Question 16 of 18
16. Question
A 1500kg car moving at 25 m/s hits an initially uncompressed horizontal spring with spring constant of 2.0 × 106 N/m. What is the maximum compression of the spring? (Neglect the mass of the spring.)
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Question 17 of 18
17. Question
The kinetic friction force between a 60.0kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
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Question 18 of 18
18. Question
A force of 10 N is applied horizontally to a 2.0kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?
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