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Review of Work, Energy and Power

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Terms and Formulae

Further Reading

1. Work is defined as

2. What are the units of work?

3. What is the sign of the work done by gravity on a man standing on a platform?

4. A force of 10 N works on a ball over a distance of 5 m. The force is parallel to the displacement of the ball. What is the total work done by the force?

5. A force of 10 N works on a ball over a distance of 5 m. The force is perpendicular to the displacement of the ball. What is the total work done by the force?

6. A force of 10 N works on a ball over a distance of 5 m. The force is antiparallel to the displacement of the ball. What is the total work done by the force?

7. The work done by a given force over a given distance is proportional to

8. What is the sign of the work performed on an object in uniform circular motion?

9. How much work is performed by gravity on an object of mass m in free fall over a distance of h meters?

10. A force of 1 N, parallel to the displacement of the object, acts on an object over a distance of 1 m. How much work is done?

11. How is work related to acceleration?

12. A constant force of 10 N causes a box to move at a constant speed of 2 m/s. How much work is done in 10 seconds?

13. A mass is kept stationary by an external force. All of the following are true EXCEPT:

14. What is the magnitude of the work done by a force acting on a particle instantaneously?

15. How is work defined in terms of integrals?

16. Energy is measured in the same units as

17. Kinetic energy is proportional to

18. A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the kinetic energy of the particle?

19. A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the change in the kinetic energy of the particle?

20. According to the work-energy theorem, a net work causes

21. A particle of mass 1 kg experiences a net work of 100 N. what is the change in kinetic energy of the particle?

22. A particle of mass 1 kg experiences a net work of 100 N. what is the change in the velocity of the particle?

23. An object falls a distance of h meters. What is the increase in the object's velocity over this distance?

24. What can be said about the kinetic energy of an object in uniform circular motion?

25. Kinetic energy is

26. Power is defined as

27. The units of power are defined as

28. A constant force acting over a given distance requires

29. In a period of 10 seconds, an elevator lifts a weight of 1000 N a distance of 10 m at constant velocity. What is the average power of the elevator over this time?

30. At a given point, a force of 20 N acts on a particle with velocity of 5 m/s what is the power exerted by the force?

31. How many principles of conservative forces are there?

32. Which of the following is NOT a conservative force?

33. The work done by a conservative force over a closed loop is always

34. The work done by friction over any distance is always

35. Path independence for conservative forces means that

36. Conservative forces always

37. Potential energy is defined for

38. The potential energy is always the same for an object with the same

39. Potential energy is defined as

40. In what way is potential energy related to work?

41. The sum of potential and kinetic energy is always

42. The sum of the change in kinetic and potential energy is always

43. Total mechanical energy is defined as

44. The potential energy of gravity is defined as

45. The change in potential energy is always equal to the

46. A mass m is allowed to drop from a height h. What it its velocity when it reaches the ground?

47. What is the total mechanical energy of a mass of 2 kg oscillating on a spring given that the maximum velocity of the mass is 5 m/s and the spring constant is 50 N/m?

48. At what point in the oscillation of a spring is the kinetic energy maximum?

49. What is the symbol for total mechical energy?

50. How is potential energy defined in terms of a position dependent force?