AP Physics C: Work, Energy and Power Quiz 2
3. Work, Energy and Power Quiz 2
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Question 1 of 27
1. Question
A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
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Question 2 of 27
2. Question
In a baseball game, the catcher stops a 90mph pitch. What can you say about the work done by the catcher on the ball?
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Question 3 of 27
3. Question
A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?
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Question 4 of 27
4. Question
A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box?
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Question 5 of 27
5. Question
Two stones, one twice the mass of the other, are dropped from a cliff. Just before hitting the ground, what is the final speed of the heavy stone compared to the light one?
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Question 6 of 27
6. Question
A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?
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Question 7 of 27
7. 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 8 of 27
8. 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 9 of 27
9. 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 10 of 27
10. 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 11 of 27
11. 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 12 of 27
12. 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 13 of 27
13. Question
Mike performed 5 J of work in 10 s. Joe did 3 J of work in 5 s. Who produced the greater power?
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Question 14 of 27
14. Question
A crane can lift a 500 kg mass to height of 30 m in 2 minutes. The power at which the crane is operating is
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Question 15 of 27
15. Question
Drew lifts a 60kg crate onto a truck bed 1 meter high in 3 seconds. Connor lifts sixty 1kg boxes onto the same truck in a time of 2 minutes. Which of the following statements is true?
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Question 16 of 27
16. Question
Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle of 37.0° upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?
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Hint
W= Fd cos θ

Question 17 of 27
17. Question
If it takes 50 m to stop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition?
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Question 18 of 27
18. Question
A force moves an object in the direction of the force. The graph shows the force versus the object’s position. Find the work done when the object moves from 0 to 6.0 m.
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Question 19 of 27
19. 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 20 of 27
20. 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 21 of 27
21. 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 22 of 27
22. 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 23 of 27
23. 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 24 of 27
24. 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 25 of 27
25. 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 26 of 27
26. Question
A 1500kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W)
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Question 27 of 27
27. Question
A 51 kg woman runs up a flight of stairs in 5.0 s. Her net upward displacement is 5.0 m. Approximately, what average power did the woman exert while she was running?
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