Newton's Laws of Motion – Multiple Choice Test
Choose the letter of the correct answer.
1. What is the definition of inertia?
A. The weight of an object
B. The resistance to change in motion
C. The force that moves an object
D. The amount of energy in motion
2. Which law states that a net force causes acceleration?
A. Law of Inertia
B. Law of Gravity
C. Law of Acceleration
D. Law of Interaction
3. What is the formula for Newton’s Second Law?
A. F = ma
B. W = mg
C. V = d/t
D. a = v/t
4. What is the SI unit of force?
A. Kilogram
B. Joule
C. Newton
D. Watt
5. A person in a moving car lurches forward when it stops. This demonstrates which law?
A. First Law
B. Second Law
C. Third Law
D. Law of Gravitation
6. What happens to acceleration if the force increases but mass stays the same?
A. Acceleration stays the same
B. Acceleration decreases
C. Acceleration increases
D. Acceleration becomes zero
7. What happens to acceleration if the mass increases and force stays the same?
A. Acceleration increases
B. Acceleration decreases
C. Acceleration stays the same
D. Acceleration becomes infinite
8. Which law explains the need for seatbelts in cars?
A. Law of Gravity
B. Law of Interaction
C. Law of Acceleration
D. Law of Inertia
9. What law explains rocket launch motion?
A. Law of Inertia
B. Law of Conservation
C. Law of Acceleration
D. Law of Interaction
10. For every action, there is an equal and opposite _______.
A. effect
B. mass
C. reaction
D. acceleration
11. Which of the following shows the effect of force on a light object?
A. A bus slowly stopping
B. A ball easily thrown
C. A truck barely moving
D. A mountain not moving
12. What is the weight of a 10 kg object on Earth? (g = 9.8 m/s²)
A. 98 N
B. 10 N
C. 9.8 N
D. 100 N
13. What do we call the downward force due to gravity?
A. Friction
B. Force
C. Acceleration
D. Weight
14. What is mass?
A. The weight of an object
B. The amount of matter in an object
C. The space an object occupies
D. The force applied on an object
15. Which has greater inertia?
A. A stone
B. A coin
C. A car
D. A feather
16. What is the acceleration of a 3 kg object pushed with a 12 N net force?
A. 4 m/s²
B. 15 m/s²
C. 36 m/s²
D. 9 m/s²
17. A 1.5 kg book falls freely. What is the force of gravity on it?
A. 1.5 N
B. 9.8 N
C. 14.7 N
D. 19.6 N
18. Which object resists a change in motion the most?
A. Ball
B. Pencil
C. Truck
D. Kite
19. Which pair of forces best shows Newton’s Third Law?
A. Gravity and weight
B. Pull and push
C. Action and reaction
D. Balanced and unbalanced forces
20. What happens if the net force on an object is zero?
A. It speeds up
B. It changes direction
C. It stops immediately
D. It stays at rest or moves at constant velocity
21. Which of the following is true about force and motion?
A. A larger mass requires less force
B. Force does not affect acceleration
C. Mass and acceleration affect net force
D. Mass is not needed to compute force
22. Which of the following is not an action-reaction pair?
A. Jumping off a boat and the boat moves
B. Sitting on a chair and the chair exerts a force
C. A person lifting weights and sweating
D. A balloon releasing air and moving
23. A 4 kg box is pushed with a net force of 20 N. What is its acceleration?
A. 80 m/s²
B. 5 m/s²
C. 24 m/s²
D. 16 m/s²
24. A ball hits a wall and bounces back. Which law is demonstrated?
A. First Law
B. Second Law
C. Third Law
D. Law of Gravity
25. The ability of an object to resist a change in motion is:
A. Speed
B. Inertia
C. Energy
D. Friction
26. If the same force is applied, which will accelerate more?
A. Heavy truck
B. Empty cart
C. Big rock
D. Full barrel
27. Why is it hard to push a heavy object?
A. It has less mass
B. It has more inertia
C. It has no friction
D. It is soft
28. A falling object without air resistance falls with:
A. Increasing acceleration
B. Decreasing acceleration
C. Constant acceleration
D. No acceleration
29. A bus suddenly stops and you move forward. Why?
A. Force from the seat
B. Gravity
C. Friction
D. Inertia
30. Which factor does NOT affect acceleration?
A. Mass
B. Net force
C. Velocity
D. Direction of force
