Momentum in two dimensions and collisions Quiz
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5 questions, one answer each
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1. Which quantity is conserved in an inelastic collision with no external force?
- A. Kinetic energy
- B. Momentum
- C. Speed of each object
- D. Both kinetic energy and speed
2. A 2.0 kg trolley moving at 3.0 m s⁻¹ hits a stationary 1.0 kg trolley and they stick together. What is their speed?
- A. 1.0 m s⁻¹
- B. 2.0 m s⁻¹
- C. 3.0 m s⁻¹
- D. 4.0 m s⁻¹
3. A body of mass 4.0 kg has momentum 12 kg m s⁻¹. What is its kinetic energy?
- A. 3.0 J
- B. 6.0 J
- C. 18 J
- D. 36 J
4. Two equal masses collide. Before the collision the total kinetic energy is 10 J and after it is 7 J. What type of collision is this?
- A. Elastic
- B. Explosive
- C. Impossible
- D. Inelastic
5. A ball moving east collides with a stationary ball and the two move off at angles to the east direction. Which statement about the east components of momentum is correct?
- A. The total east momentum before equals the total east momentum after
- B. The total east momentum is lost in the collision
- C. The east momentum is conserved only if the collision is elastic
- D. The east momentum after is greater than before