Momentum, impulse and collisions Quiz
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5 questions, one answer each
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1. A 2.0 kg trolley moving at 3.0 m s⁻¹ collides with and sticks to a stationary 1.0 kg trolley. What is their common speed?
- A. 1.0 m s⁻¹
- B. 2.0 m s⁻¹
- C. 3.0 m s⁻¹
- D. 4.5 m s⁻¹
2. The area under a force-time graph represents
- A. kinetic energy
- B. impulse
- C. power
- D. acceleration
3. A force of 50 N acts on an object for 0.20 s. What is the change in its momentum?
- A. 250 kg m s⁻¹
- B. 0.0040 kg m s⁻¹
- C. 50.2 kg m s⁻¹
- D. 10 kg m s⁻¹
4. A stationary gun of mass 4.0 kg fires a 0.020 kg bullet at 200 m s⁻¹. What is the recoil speed of the gun?
- A. 1.0 m s⁻¹
- B. 0.50 m s⁻¹
- C. 2.0 m s⁻¹
- D. 200 m s⁻¹
5. Which statement about a perfectly elastic collision is correct?
- A. Momentum is conserved but kinetic energy is not
- B. Kinetic energy is conserved but momentum is not
- C. Both momentum and kinetic energy are conserved
- D. Neither is conserved