Laws of Motion Mock Test – Class 11 Physics

1. A car moves around a level circular road of radius . If and , the maximum speed without skidding is

2. A block is pushed horizontally with on a rough floor. The coefficients are and , with . What happens initially?

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

4. A block rests on a horizontal table and has no vertical acceleration. If its mass is and , the normal reaction of the table is

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

6. In the rough-surface two-block system with masses and , a force pushes the block, , and the acceleration is . The contact force on the block is

7. Study the table and identify the row that contains an unsuitable statement about momentum.

8. In an Atwood machine, , , and . The magnitude of acceleration is

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

If external horizontal force is negligible, is

10. A stationary truck has large mass but zero velocity. Its momentum is

11. A collision record gives total momentum before collision as . After collision, body P has momentum . If external impulse is negligible, body Q must have momentum

12. 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

13. 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

14. A block slides down a rough incline with acceleration . If , the expression becomes

15. A spring balance pulls a block on a smooth horizontal table and reads . The acceleration of the block is

16. A body moving in a circle at constant speed is not in a state of unchanged motion because

17. 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

18. A proposed formula for force is , where is mass, is velocity, and is time. Its dimensional check gives

19. A constant net force of acts on a body along a straight line for . The change in momentum of the body is

20. A cyclist leans more while taking a sharper turn at the same speed. This is because

21. The normal reaction exerted by a surface on a body is always directed

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

23. A block on a smooth inclined plane is connected to a hanging mass. Taking , the system’s acceleration magnitude is

24. Assertion: Internal forces cannot change the total momentum of an isolated system.
Reason: Internal forces between two parts of the system occur in equal and opposite pairs.

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

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

27. The angle of repose is the angle of an inclined plane at which a body

28. A mass moves in a vertical circle of radius . At the top, the string just becomes slack at speed . The relation at that instant is

29. 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

30. Uniform circular motion has constant speed but is still accelerated motion because

31. In an ideal light string passing over an ideal smooth pulley, the tension is usually taken to be

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

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

34. 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

35. Read the situation below and answer the question.

What conclusion is best supported by this comparison?

36. A cart has momentum east at one instant and east later. The average net external force during this interval is

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

38. A object is at rest on a rough horizontal surface. A gradually increasing horizontal force is applied. The maximum static friction is , and kinetic friction is . If the applied force is , the acceleration after motion begins is

39. A force of acts for , while another force of acts for in the same direction. The impulses are

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

41. A data record for a constant-mass body is shown below.

If the acceleration in Case P is , the acceleration in Case S is

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

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

44. A weighing scale under a person reads the normal reaction . A person stands in a lift accelerating upward at . Taking , the scale reading is

45. A ball initially moving east is struck so that its momentum changes toward west. The average force during the strike is directed

46. Match each force with its Newton’s third-law partner.

The suitable matching is

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

48. A force of north and a force of south do not produce the same effect on a body because force has

49. A car takes a banked turn at a speed greater than the frictionless design speed. The tendency of the car is to move

50. Read the case below and answer the question.

Which description about the frames is most suitable?