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Basic Physics Practice Test: Work and Energy
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The work-energy principle:  The net work done on an object is equal to the change in the object's kinetic energy.

The principle of conservation of mechanical energy for conservative forces: If only conservative forces are acting, the total mechanical energy of a system neither increases nor decreases in any process. It stays constantπit is conserved.
The law of conservation of energy: The total energy is neither increased nor decreased in any process. Energy can be transformed from one form to another, and transferred from one object to another, but the total amount remains constant.
 

Basic Physics Practice Test: Work and Energy
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25 Questions

1. A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheels?
2. A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?
3. A horizontal force of 200 N is applied to move a 55-kg cart (initially at restacross a 10 m level surface. What is the final speed of the cart?"
4. The quantity mgy is
5. A force moves an object in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.
6. A cyclist does work at the rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 m/s?
7. A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 ˛ 103 J, what is the speed of the skier on reaching the bottom of the slope?
8. A 30-N box is pulled 6.0 m up along a 37e inclined plane. What is the work done by the weight (gravitational forceof the box?"
9. 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?
10. A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car?
11. Compared to yesterday, you did 3 times the work in one-third the time. To do so, your power output must have been
12. 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?
13. A projectile of mass m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?
14. An arrow of mass 20 g is shot horizontally into a bale of hay, striking the hay with a velocity of 60m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?
15. A 50-N object was lifted 2.0 m vertically and is being held there. How much work is being done in holding the box in this position?
16. Of the following, which is not a unit of power?
17. On a plot of Force versus position (F vs. x), what represents the work done by the force F?
18. A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. What is the spring constant?
19. A 1500-kg 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.)
20. A spring is characterized by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?
21. Is it possible for a system to have negative potential energy?
22. An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U.
23. A 500-kg elevator is pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevator?
24. An object is lifted vertically 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting it?
25. Calculate the work required to compress an initially uncompressed spring with a spring constant of 25 N/m by 10 cm.