Momentum Quiz
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5 questions, one answer each
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1. What is the equation for momentum?
- A. A. p = m / v
- B. B. p = m x v
- C. C. p = F x t
- D. D. p = m x a
2. In a closed system, what happens to total momentum during a collision?
- A. A. It always decreases
- B. B. It always increases
- C. C. It stays the same before and after
- D. D. It becomes zero
3. A 1000 kg car changes momentum by 20000 kg m/s in a collision lasting 0.1 s. What average force acts on the car?
- A. A. 2000 N
- B. B. 20000 N
- C. C. 200000 N
- D. D. 2000000 N
4. Why do crumple zones reduce injury in a car crash?
- A. A. They reduce the car's total momentum before impact
- B. B. They increase the time taken for momentum to change, reducing the force
- C. C. They increase the mass of the car, reducing acceleration
- D. D. They prevent any change in momentum during the crash
5. A stationary firework explodes into two pieces flying apart in opposite directions. What does conservation of momentum require?
- A. A. Both pieces must have equal mass
- B. B. Both pieces must have equal speed
- C. C. The total momentum of the pieces after the explosion must be zero, matching the momentum before
- D. D. Momentum is not conserved in explosions