Momentum and conservation of momentum Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. A 2.0 kg trolley moves at 3.0 m s⁻¹. What is its momentum?
- A. 1.5 kg m s⁻¹
- B. 5.0 kg m s⁻¹
- C. 6.0 kg m s⁻¹
- D. 9.0 kg m s⁻¹
2. A 1.0 kg trolley at 4.0 m s⁻¹ collides with a stationary 3.0 kg trolley and they stick together. What is their common speed?
- A. 1.0 m s⁻¹
- B. 1.3 m s⁻¹
- C. 2.0 m s⁻¹
- D. 4.0 m s⁻¹
3. Which statement about Newton's third law is correct?
- A. The two forces act on the same body and cancel
- B. The two forces are equal, opposite and act on different bodies
- C. The larger body exerts the larger force
- D. The forces only act when the bodies are at rest
4. A force of 20 N acts on a body for 0.50 s. What is the change in its momentum?
- A. 0.025 kg m s⁻¹
- B. 40 kg m s⁻¹
- C. 20 kg m s⁻¹
- D. 10 kg m s⁻¹
5. A passenger stops in a collision. Why does an air bag reduce the force on the passenger?
- A. It reduces the passenger's momentum
- B. It increases the time over which the momentum changes, so F = Δp/Δt is smaller
- C. It reduces the passenger's mass
- D. It makes the collision elastic