Laws of Motion Mock Test – Class 11 Physics

1. A diagram is described in words: a block has arrows , , and acting on it. Arrow is right, arrow is left, and arrow is left. The block’s horizontal net force is

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

3. A cart moving right at collides with a cart moving right at . After collision, the cart moves right at . The final velocity of the cart is

4. A rubber ball hits a wall with velocity east and rebounds with velocity west. Taking east as positive, the change in momentum is

5. Newton’s second law in momentum form relates net external force to

6. Two masses and are connected over an ideal pulley, with . The acceleration magnitude of the system is

7. A body is moving in a straight line with increasing speed. The net force on it must have

8. A horizontal force of fixed magnitude acts separately on bodies of masses , , and . The accelerations are in the ratio

9. A block slides to the right on a rough horizontal surface while no external horizontal push is applied. The friction force and acceleration are

10. A ball strikes a wall at east and rebounds at west. Taking east as positive, the impulse on the ball is

11. A block is pulled on a rough horizontal surface by a force making angle above the horizontal. The normal reaction is best written as

12. A dust particle is removed from a carpet by beating the carpet. The dust separates mainly because

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

14. A force-time graph for a collision has total area over a contact time of . The average force during contact is

15. A body experiences a net force whose components are east and north. Its acceleration is

16. Study the before-after record for a one-dimensional collision on a smooth horizontal track.

If external horizontal force is negligible, is

17. The derivation of momentum conservation for two interacting bodies uses Newton’s third law mainly to show that

18. A coin lies on a smooth tray inside a train. The train moves with constant velocity along a straight track, and the coin remains at rest relative to the tray. This observation is consistent with treating the train frame as

19. In a derivation using , if , then

20. A graph of centripetal acceleration against is drawn for a fixed radius . The slope of the graph is

21. A conical pendulum has string length and the string makes angle with the vertical. The radius of the circular path is

22. Match each circular-motion situation with the force that can act as the centripetal force.

The suitable matching is

23. The table describes a two-block horizontal system on a smooth surface.

The unsuitable row is

24. Study the table and identify the row that correctly states the conservation condition.

25. Two bodies of masses and are initially at rest on a smooth surface. They push apart due only to an internal spring. If the body of mass moves right with speed , the body of mass moves

26. Assertion: The actual value of static friction can be less than .
Reason: represents the maximum static friction just before slipping.

27. A horizontal pull is applied to a block on a rough floor. The block is just about to move. At this instant, the friction force is

28. A force-time graph is a trapezium: force increases uniformly from to during . The impulse is

29. The pair “weight of a book” and “normal reaction of the table on the book” is not a Newton’s third-law pair because

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

The suitable matching is

31. A force pulls a block at above the horizontal on a rough horizontal floor. Taking , the normal reaction is

32. A force-acceleration graph for a body is a straight line, but it does not pass through the origin. One likely reason is that

33. 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

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

35. In a momentum calculation, a body changes velocity from to . For constant mass , the change in momentum is

36. A block slides up a rough inclined plane of angle with coefficient of kinetic friction . Taking up the plane as positive, its acceleration is

37. For three forces , , and keeping a particle in equilibrium, the angles opposite these forces in the force triangle are , , and . Lami’s theorem gives

38. Read the case below and answer the question.

What is the best conclusion?

39. A block of mass on a rough inclined plane tends to slide down while connected to a light string. The tension in the string acts up the plane. At limiting equilibrium, the correct balance is

40. A horizontal table-and-hanging-mass system is at rest. The maximum static friction on the table block is . The hanging mass has weight . The system

41. A person jumps from a boat to the shore, and the boat moves backward. This is best explained by

42. A car of mass moving at enters a level curve of radius . The maximum static friction available is . The car will

43. The SI unit of impulse is

44. A particle moves with constant speed in a circle of radius . Its centripetal acceleration is

45. A box is placed on an inclined plane. The normal reaction of the plane on the box is

46. A block has limiting friction on a horizontal rough floor. A horizontal force of is applied, but the block remains at rest. The friction force is

47. A satellite in a circular orbit around Earth is acted on mainly by Earth’s gravity. In this motion, gravity

48. In a non-uniform circular motion, the speed is decreasing while the body continues on a circular path. The tangential component of acceleration is directed

49. A body can have a change in momentum even when its speed remains constant if

50. A heavy truck and a light car moving with the same speed are brought to rest in the same time. The average stopping force is larger for the truck because