Class 9 Physics Chapter 3 – Dynamics-MCQs-(FBISE)

1. Dynamics is the branch of mechanics that studies:

2. A push or pull acting on a body is called:

3. The SI unit of force is:

A) Joule
B) Watt
C) Pascal
D) Newton ()

4. According to Newton’s First Law, a body at rest remains at rest unless acted upon by:

5. The tendency of a body to resist any change in its state of rest or motion is called:

6. The inertia of an object depends upon its:

7. Newton’s Second Law is commonly expressed as:

A)
B)
C)
D)

8. The SI unit of momentum is:

A) kg
B)
C) N
D) J

9. Momentum is calculated using:

A)
B)
C)
D)

10. If the net force acting on an object is zero, the object will:

11. Newton’s Third Law states that:

A)
B) Momentum is conserved
C) Inertia depends on velocity
D) Every action has an equal and opposite reaction

12. Friction always acts:

13. Which type of friction acts between two surfaces at rest?

14. A force of acts on a mass of . The acceleration produced is:

A)
B)
C)
D)

15. Which quantity is always conserved in an isolated system during collisions?

16. The weight of an object is a:

17. Weight is calculated using the relation:

A)
B)
C)
D)

18. Which of the following has the greatest inertia?

A) A truck of mass
B) A bicycle of mass
C) A football of mass
D) A cricket ball of mass

19. The unit is equal to:

A)
B)
C)
D)

20. If the mass of an object doubles while its velocity remains constant, its momentum will:

21. Which law explains why passengers move forward when a moving bus stops suddenly?

22. The force responsible for slowing down a moving object on a rough surface is:

23. A force of acts on a body of mass . Its acceleration is:

A)
B)
C)
D)

24. Which quantity is measured in newtons?

25. Rolling friction is generally:

26. A body of mass moving with velocity has momentum:

A)
B)
C)
D)

27. Which of the following is a vector quantity?

28. The force exerted by the Earth on a body is called its:

29. If the net force on an object is doubled while its mass remains constant, its acceleration will:

30. Which law is based on the relationship ?

31. In SI units, weight is measured in:

A) Kilograms
B) Grams
C)
D) Newtons

32. The tendency of a moving body to continue moving in a straight line is due to:

33. Which type of friction acts when a book slides across a table?

34. If and , the weight of the object is:

A)
B)
C)
D)

35. Which force opposes the relative motion between two surfaces in contact?

36. A rocket moves upward because:

37. The product of mass and velocity is called:

38. A force of acts on a body of mass . The acceleration produced is:

A)
B)
C)
D)

39. The SI unit of mass is:

A) Newton
B) Gram
C) Pound
D) Kilogram ()

40. Which of the following reduces friction?

41. The reaction force in Newton’s Third Law acts:

42. Which property makes it difficult to start moving a heavy object?

43. The weight of a body on the Moon is:

44. A football of mass moving at has momentum:

A)
B)
C)
D)

45. Which statement about mass is correct?

46. Seat belts in cars are primarily based on:

47. If the velocity of an object becomes zero, its momentum is:

48. Which of the following is an example of rolling friction?

49. According to Newton’s Second Law, acceleration is directly proportional to:

50. Which of the following best defines dynamics?