Laws of Motion Mock Test – Class 11 Physics

1. A body of mass moves with constant speed in a circle of radius . A proposed expression for the required inward force is . The main problem with this expression is that

2. A constant force of acts east on a body for . The impulse delivered to the body is

3. A block on a rough horizontal surface has and . A horizontal pull of is applied. Taking , the block’s initial acceleration after it starts sliding is

4. Read the situation below and answer the question.

What conclusion is best supported by this comparison?

5. A moving cart collides with another cart and the two stick together. This collision is suitable for applying conservation of momentum when

6. Increasing the stopping time for the same change in momentum reduces the average force because

7. A body moving west has momentum directed

8. A body is constrained to move only along the -axis on a smooth horizontal track. A force component perpendicular to the track is balanced by contact forces. The useful equation for acceleration along the track is

9. A ball moving east at is brought to rest in . Taking east as positive, the average force on the ball is

10. In uniform circular motion, the net force required to keep a body on the circular path is directed

11. A two-particle system has momenta and along the same straight line. The total momentum of the system is

12. Two blocks collide on a smooth horizontal surface and are treated together as one system. During the collision, the contact force exerted by one block on the other is

13. A ball rolls with constant velocity on a long, level, nearly frictionless track. The net horizontal force on the ball is best described as

14. Friction is useful in walking because the ground exerts on the foot a static friction force that is usually directed

15. The steps below are used to derive the constant-mass form of Newton’s second law.
I. Start with .
II. Use .
III. For constant , write .
IV. Use .
The final result is

16. A person jumps from a slowly moving cart and tends to fall forward on the ground. The most suitable reason is that the person’s body tends to

17. A person moving at is brought to rest. The magnitude of impulse on the person is

18. A car on a level circular road requires friction for safe turning, but the maximum static friction available is . The car will

19. In an accelerating frame, an apparent force may be introduced only to

20. A student compares two methods for a sticking collision. Method P uses conservation of momentum. Method Q assumes the two bodies keep their separate velocities after sticking. The suitable method is

21. A body is acted on by two perpendicular net force components, along and along . For mass , the magnitude of acceleration is

22. A body has momentum along a straight line. The graph of against is a horizontal line. According to Newton’s second law in momentum form, the net force is

23. Study the table and identify the force classification that is not suitable.

24. A force is completely specified only when its magnitude is given along with

25. Match the interaction with the most suitable force description.

The suitable matching is

26. Two trolleys are initially at rest on a smooth floor. Trolley P has mass , and trolley Q has mass . The same horizontal force acts on each trolley separately. Compared with trolley Q, trolley P will have

27. The tension at the lowest point of a vertical circle is generally larger than the tension at the highest point for the same speed because

28. The table gives four force-mass situations for bodies initially on smooth horizontal surfaces.

The row containing an incorrect acceleration is

29. A rough horizontal table has a block connected to a hanging mass. Before writing , the friction check that must be made first is whether

30. A small object moves in a circle of radius with speed . Its centripetal acceleration is

31. Friction is a contact force that acts mainly to oppose

32. Two bodies interact only with each other in deep space. During the interaction, one body gains momentum . The momentum change of the other body is

33. In a straight-line motion problem, the acceleration is found to be negative when east is chosen as positive. The net force is then

34. A block slides down a smooth inclined plane of angle . Taking , its acceleration down the plane is

35. A body of mass moves east with speed . A force changes only the direction of velocity so that it moves north with the same speed. The magnitude of change in momentum is

36. For a frictionless banked road of banking angle , the design speed satisfies

37. Static friction differs from kinetic friction because static friction

38. During walking, the foot pushes the ground backward. The ground helps the person move forward because it exerts

39. A force that one part of a system exerts on another part of the same chosen system is called internal relative to that system. If two blocks connected by a string are treated together as one system, the tension in the string is

40. A body is momentarily at rest at the highest point of a vertical throw. The net force on it at that instant, neglecting air resistance, is

41. A block on a smooth horizontal surface is acted upon by to the right and to the left. Its acceleration is

42. A block is just about to slide up a rough inclined plane because of an external force applied up the plane. The friction force acts

43. A body moves east with velocity . Its momentum is

44. A block is pulled along a rough horizontal surface by a horizontal force of . If and , its acceleration is

45. A stone is whirled in a horizontal circle of radius with speed . The required centripetal force is

46. A block rests on a rotating horizontal platform at radius . If the platform has angular speed , the static friction needed to prevent slipping is

47. A mass has weight on Earth when . On a planet where , its mass and weight are

48. For a fixed net force, an versus graph is drawn. Its slope represents

49. A conical pendulum bob moves in a circle of radius with speed . If the bob has mass , the horizontal component of tension is

50. In a derivation using , if , then