Kinetic and potential energy and work–energy theorem - One Line Questions

1. The work done by gravity when an object falls from height h to the ground is: — mgh
2. A ball of mass 'm' is dropped from a height 'h'. Its potential energy at height 'h' is: — mgh
3. A spring is compressed by 0.1 m. If the spring constant is 200 N/m, the potential energy stored is: — 1 J
4. Gravitational potential energy near the Earth's surface is given by: — mgh
5. A 5 kg object is moving with a velocity of 2 m/s. If its velocity increases to 4 m/s, the change in its kinetic energy is: — 30 J
6. A 0.5 kg object is moving at 10 m/s. If a force does 20 J of work on it, its new velocity will be approximately: — 14.1 m/s
7. A block of mass 5 kg is lifted vertically by 3 meters. The work done against gravity is: — 150 J
8. A 2 kg object is at rest. A net force of 4 N acts on it for 3 seconds. What is its kinetic energy at the end of 3 seconds? — 36 J
9. If a force of 10 N acts on an object and displaces it by 5 meters in the direction of the force, the work done is: — 50 Joules
10. A car of mass 1000 kg is moving at 20 m/s. If brakes are applied and it stops, the work done by the braking force is: — -200,000 J
11. A force of 5 N acts on a particle of mass 1 kg. If the particle starts from rest, its kinetic energy after 10 seconds will be: — 2500 J
12. A 2 kg object moves with a velocity of 4 m/s. Its kinetic energy is: — 32 Joules
13. If an object's kinetic energy is 100 J and its mass is 2 kg, what is its velocity? — 10 m/s
14. A 10 kg object is at a height of 5 m. Its potential energy is (g = 10 m/s^2): — 500 J
15. A spring has potential energy stored in it when it is: — Compressed or stretched
16. The work-energy theorem is particularly useful for problems involving: — Variable forces
17. In the absence of non-conservative forces, the total mechanical energy (Kinetic Energy + Potential Energy) of a system is: — Conserved
18. If the net work done on an object is positive, its kinetic energy: — Increases
19. The work done by a conservative force is: — Independent of the path taken
20. Which of the following is an example of potential energy? — Energy of a coiled spring
21. The work done by a force F acting on an object that undergoes a displacement d is given by: — F * d
22. If a force is applied at an angle θ to the direction of displacement, the work done is: — Fd cos θ
23. Which of the following is a scalar quantity? — Work
24. If the velocity of an object is doubled, its kinetic energy will be: — Quadrupled
25. If the mass of an object is doubled and its velocity is halved, its kinetic energy will be: — Halved
26. If the net work done on an object is negative, its kinetic energy: — Decreases
27. If the speed of an object decreases, its kinetic energy: — Decreases
28. When a body falls freely under gravity, its total mechanical energy: — Remains constant
29. If a force does negative work on an object, the object's kinetic energy: — Decreases
30. The work done by a non-conservative force like friction: — Is always negative
31. What is the SI unit of work? — Joule
32. Which quantity is conserved when a body moves under a conservative force and no external forces act on it? — Total mechanical energy
33. The potential energy of a spring is given by: — 1/2 kx^2
34. What is the potential energy of an object at the ground level (reference point)? — Zero
35. What is the change in potential energy when an object of mass 'm' is raised from height h1 to h2? — mg(h2 - h1)
36. The formula for kinetic energy (KE) is: — 1/2 mv^2
37. When the ball in the previous question hits the ground, its potential energy is: — 0
38. Potential energy is the energy possessed by an object due to its: — Position or configuration
39. Potential energy is a form of energy associated with: — Position
40. The work-energy theorem is a direct consequence of: — Newton's second law
41. Kinetic energy is defined as the energy possessed by an object due to its: — Motion
42. Kinetic energy is a form of energy associated with: — Motion
43. A body is moving with a constant velocity. The net work done on it is: — Zero
44. The work done by friction is always: — Negative
45. What is the work done by the centripetal force in circular motion? — Zero
46. The work-energy theorem states that the net work done on an object is equal to the change in its: — Kinetic energy
47. If an object's kinetic energy is K, and its mass is m, what is its momentum p? — sqrt(2mK)
48. Which of the following is an example of kinetic energy? — A flying airplane
49. When is the work done by a force zero? — All of the above
50. Which of the following statements is true about work done? — Work done can be positive, negative, or zero.
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