MomentumCopy
1. What is the momentum of a 5 kg object moving at 3 m/s?
A. 1.67 kg·m/s
B. 8 kg·m/s
C. 15 kg·m/s
D. 0.6 kg·m/s
2. A 2 kg trolley moves at 4 m/s. What is its momentum?
A. 8 N
B. 6 kg·m/s
C. 2 kg·m/s
D. 8 kg·m/s
3. A stationary object has a momentum of:
A. 1 kg·m/s
B. Zero
C. Depends on mass
D. Infinite
4. Momentum is a:
A. Scalar quantity
B. Vector quantity
C. Constant for all objects
D. Non-measurable quantity
5. A 10 kg object is at rest. What is its momentum?
A. 0 kg·m/s
B. 5 kg·m/s
C. 10 kg·m/s
D. Cannot be determined
6. If the velocity of an object doubles, its momentum:
A. Halves
B. Remains the same
C. Doubles
D. Quadruples
7. Which of the following has the greatest momentum?
A. 1 kg at 10 m/s
B. 2 kg at 5 m/s
C. 5 kg at 2 m/s
D. 10 kg at 1 m/s
8. What is the unit of momentum?
A. N
B. m/s
C. kg·m/s
D. kg/m²
9. The product of mass and velocity is called:
A. Inertia
B. Acceleration
C. Force
D. Momentum
10. What is the impulse of a 10 N force applied for 3 seconds?
A. 30 N·s
B. 3 N·s
C. 10 N·s
D. 0.3 N·s
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
11. Impulse is equivalent to:
A. Change in force
B. Change in acceleration
C. Change in momentum
D. Change in energy
12. Which formula correctly expresses impulse?
A. F = ma
B. p = mv
C. impulse = F × t
D. impulse = m × a
13. A 2 kg ball strikes a wall and rebounds with the same speed. What is the change in momentum?
A. 0
B. 2 kg·m/s
C. 4 kg·m/s
D. Cannot be found
14. The area under a force-time graph gives:
A. Acceleration
B. Work
C. Impulse
D. Velocity
15. Which of the following quantities are conserved in a perfectly elastic collision?
A. Momentum only
B. Kinetic energy only
C. Both momentum and kinetic energy
D. Force
16. A truck (mass 4000 kg) moves at 10 m/s. A car (mass 1000 kg) moves at 40 m/s. Which has more momentum?
A. Truck
B. Car
C. Both same
D. Cannot be determined
17. What is the resultant force if a change in momentum is 20 kg·m/s in 4 seconds?
A. 2 N
B. 5 N
C. 80 N
D. 0.2 N
18. What is the SI unit of impulse?
A. kg·m/s
B. N
C. N·s
D. m/s²
19. Which of the following is NOT an example of impulse?
A. Hitting a cricket ball
B. A car crash
C. Constant speed motion
D. Jumping off a table
20. What happens to the momentum of a system when no external force acts?
A. It decreases
B. It increases
C. It remains constant
D. It depends on velocity
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
21. A 6 kg ball moves at 5 m/s and collides with a stationary 2 kg ball. After the collision, the 6 kg ball moves at 3 m/s. What is the velocity of the 2 kg ball if momentum is conserved?
A. 6 m/s
B. 9 m/s
C. 12 m/s
D. 3 m/s
22. A force of 50 N acts for 0.4 s. What is the impulse?
A. 20 N·s
B. 10 N·s
C. 0.8 N·s
D. 200 N·s
23. A 2.5 kg trolley is accelerated from rest to 8 m/s in 4 seconds. What is the average resultant force?
A. 2.5 N
B. 5 N
C. 6.25 N
D. 10 N
24. A force of 100 N acts for 0.2 seconds. What is the change in momentum?
A. 5 kg·m/s
B. 20 kg·m/s
C. 25 kg·m/s
D. 50 kg·m/s
25. If momentum changes by 60 kg·m/s over 3 seconds, what is the average force?
A. 15 N
B. 18 N
C. 20 N
D. 25 N
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
26. A 1.5 kg ball moving at 2 m/s strikes a wall and comes to rest in 0.1 seconds. What is the average force applied by the wall?
A. 15 N
B. 20 N
C. 25 N
D. 30 N
27. A 0.2 kg ball hits a bat and rebounds in the opposite direction. If initial speed was 4 m/s and final speed is -3 m/s, what is the change in momentum?
A. -1.4 kg·m/s
B. 1.4 kg·m/s
C. -0.2 kg·m/s
D. 0.2 kg·m/s
28. A 4 kg mass is moving at 7 m/s. It is brought to rest in 2 seconds. What is the average force applied?
A. 10 N
B. 12 N
C. 14 N
D. 16 N
29. Two objects collide and stick together. This type of collision is called:
A. Elastic
B. Inelastic
C. Explosive
D. Static
30. A 5 kg cart moving at 4 m/s collides with a 3 kg cart at rest. They stick together. What is their final velocity?
A. 2.0 m/s
B. 2.5 m/s
C. 3.0 m/s
D. 3.5 m/s
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
Answer key and explanations
1. Correct Answer: C
Explanation: p = mv = 5 × 3 = 15 kg·m/s
2. Correct Answer: D
Explanation: p = mv = 2 × 4 = 8 kg·m/s
3. Correct Answer: B
Explanation: A stationary object has 0 velocity, so momentum is 0
4. Correct Answer: B
Explanation: Momentum has direction, hence it’s a vector quantity
5. Correct Answer: A
Explanation: At rest means velocity = 0 → p = mv = 10 × 0 = 0
6. Correct Answer: C
Explanation: p = mv, so doubling v doubles p
7. Correct Answer: D
Explanation:
A: 1×10 = 10
B: 2×5 = 10
C: 5×2 = 10
D: 10×1 = 10 → All same
8. Correct Answer: C
Explanation: SI unit of momentum is kg·m/s
9. Correct Answer: D
Explanation: p = mv = momentum
10. Correct Answer: A
Explanation: Impulse = F × t = 10 × 3 = 30 N·s
11. Correct Answer: C
Explanation: Impulse = change in momentum (Δp)
12. Correct Answer: C
Explanation: Impulse = F × t
13. Correct Answer: C
Explanation: Δp = mv(final) – mv(initial) = -2v – 2v = -4v = 4kg·m/s
14. Correct Answer: C
Explanation: Area under F–t graph = impulse
15. Correct Answer: C
Explanation: In perfectly elastic collisions, both KE and p are conserved
16. Correct Answer: C
Explanation:
Truck: 4000 × 10 = 40000
Car: 1000 × 40 = 40000 → Same momentum
17. Correct Answer: B
Explanation: F = Δp / Δt = 20 / 4 = 5 N
18. Correct Answer: C
Explanation: Impulse unit is N·s
19. Correct Answer: C
Explanation: Constant motion has no change in momentum = no impulse
20. Correct Answer: C
Explanation: Conservation of momentum applies if no external force
21. Correct Answer: D
Explanation: Initial momentum = 6×5 = 30; Final momentum = 6×3 + 2×v
30 = 18 + 2v → v = 6 m/s
22. Correct Answer: A
Explanation: Impulse = 50 × 0.4 = 20 N·s
23. Correct Answer: D
Explanation:
Δp = mv = 2.5×8 = 20
F = Δp/Δt = 20 / 4 = 5 N
24. Correct Answer: A
Explanation: Impulse = F × t = 100 × 0.2 = 20 N·s
25. Correct Answer: C
Explanation: F = Δp/Δt = 60 / 3 = 20 N
26. Correct Answer: A
Explanation: Δp = mv = 1.5 × 2 = 3
F = 3 / 0.1 = 30 N
27. Correct Answer: B
Explanation:
Initial = 0.2×4 = 0.8
Final = 0.2×(-3) = -0.6
Δp = |-0.6 – 0.8| = 1.4 kg·m/s
28. Correct Answer: C
Explanation:
Δp = mv = 4×7 = 28
F = 28 / 2 = 14 N
29. Correct Answer: B
Explanation: Sticking = inelastic
30. Correct Answer: B
Explanation:
Initial p = 5×4 + 3×0 = 20
Final v = 20 / (5+3) = 2.5 m/s