Momentum and conservation of linear momentum Quiz
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5 questions, one answer each
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1. A 0.50 kg ball moves at 4.0 m s⁻¹. What is its momentum?
- A. 0.13 kg m s⁻¹
- B. 8.0 kg m s⁻¹
- C. 2.0 kg m s⁻¹
- D. 4.5 kg m s⁻¹
2. A 2.0 kg trolley at 3.0 m s⁻¹ collides with a stationary 1.0 kg trolley and they stick together. What is their speed afterwards?
- A. 1.0 m s⁻¹
- B. 1.5 m s⁻¹
- C. 3.0 m s⁻¹
- D. 2.0 m s⁻¹
3. Which condition is needed for total momentum to be conserved?
- A. The collision must be elastic
- B. No external resultant force acts on the system
- C. The objects must have equal masses
- D. The objects must stop
4. A 0.020 kg bullet leaves a 4.0 kg rifle at 300 m s⁻¹. What is the recoil speed of the rifle?
- A. 1.5 m s⁻¹
- B. 0.015 m s⁻¹
- C. 60 m s⁻¹
- D. 150 m s⁻¹
5. Two skaters push apart from rest. Skater X has twice the mass of skater Y. How do their speeds compare?
- A. X moves twice as fast as Y
- B. X moves at the same speed as Y
- C. Y moves twice as fast as X
- D. Y moves four times as fast as X