Laws of Motion Mock Test – Class 11 Physics

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

2. In the notation , let the subscript mean “force on due to .” The Newton’s third-law partner of is

3. A body is in static equilibrium under two forces. A statement says, “The forces are equal and opposite, so they must be a Newton’s third-law pair.” The error is that

4. A system has a block on a table connected to a hanging mass. A student writes even though the hanging mass is accelerating downward. The error is that

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

6. A ball moving east at is stopped by a player. The impulse on the ball is

7. On a frictionless banked road, a vehicle can take a turn at the design speed without relying on friction because

8. A body moving east at and a body moving east at form a system. The system’s total momentum is

9. A object moving east at breaks into two pieces. One piece of mass moves east at . The piece moves with velocity

10. A light string is attached to a block and pulled. The force exerted by the string on the block is best described as

11. A student solves a lift problem and uses although the lift accelerates upward. The missing idea is that

12. A body moves only horizontally, but a force acts at an angle above the horizontal. The vertical component of the force cannot be used directly in because

13. A particle is in equilibrium under three non-parallel forces. For this to be possible, the three forces must be

14. A body moving west has momentum directed

15. A particle is pulled by two equal forces making equal angles with the vertical, and a weight acts downward. If each force makes angle with the vertical and the particle is at rest, the vertical balance is

16. In many ordinary problems on blocks, carts, and projectiles near Earth, the ground frame is approximately treated as inertial because

17. A passage about a pulley system is given below.

What is the main issue with this setup?

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

19. A body accelerates toward west while moving east. This is possible when the net force is

20. Two blocks of masses and are in contact on a smooth horizontal surface. A horizontal force of pushes the block toward the block. The acceleration of the system is

21. A bus suddenly accelerates forward, and a standing passenger seems to fall backward relative to the bus. The bus frame during this acceleration is best treated as

22. A block slides down a rough incline with constant velocity. If the incline angle is , the coefficient of kinetic friction is

23. A smooth pulley is used in a connected-body problem. In the usual ideal model, “smooth pulley” means

24. A particle is pulled by east and north. A third force keeps the particle in equilibrium. The third force must have magnitude and direction

25. Lami’s theorem can be applied to a particle in equilibrium under

26. Two blocks of masses and are connected by a light string on a smooth horizontal surface. A force pulls the block, and the common acceleration is . The tension in the string is

27. A formula is proposed for centripetal force: . A dimensional check of the right side gives

28. Study the table and identify the row that correctly names the force.

29. In a one-dimensional collision, taking right as positive mainly helps to

30. A block is pulled by two horizontal forces: to the right and to the left. If no other horizontal force acts, the horizontal acceleration of the block is

31. A car is described as moving with speed along a straight road. This statement belongs most directly to

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

33. A table compares two ways of applying the same oblique force to a block on a rough horizontal floor.

The fully suitable rows are

34. A pair of forces is suspected to be a Newton’s third-law pair. The strongest test is whether the forces

35. A force acts east and a force acts north on the same object. The magnitude of the resultant is closest to

36. The angle of friction is related to the coefficient of limiting friction by

37. A body moves in a horizontal circle. A learner says, “Since the body does not move toward the centre, no force can be acting toward the centre.” The best correction is

38. A frame moving along a straight line has velocity for without changing speed or direction. Relative to an inertial frame, it is best described as

39. A smooth table has a puck moving north at constant speed. Later, a brief sideways push acts toward east. After the push, the puck’s motion changes mainly because

40. Assertion: A frame attached to an accelerating lift is a non-inertial frame.
Reason: The lift frame has acceleration relative to an approximately inertial ground frame.

41. A two-body explosion is described below.

The total momentum after explosion is

42. The acceleration in uniform circular motion is directed

43. A force is applied up a rough inclined plane of angle to keep a block just about to move upward. If the coefficient of static friction is , the required force is

44. A graph description is given below.

For one-dimensional motion, the correct comparison of net forces is

45. In the smooth inclined-plane and hanging-mass system, the expression gives a positive value. This means

46. A book rests on a horizontal table. Earth pulls the book downward, and the table pushes the book upward. These two forces are mentioned here mainly to show that

47. A force varies with time as described below.

The impulse during the interval is

48. In a three-force equilibrium problem, two forces are and , and they act at right angles. The third force that balances them has magnitude

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

50. A rope pulls a crate with a tension force . The third-law partner of the force of the rope on the crate is