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. What is the correct equation for momentum?
- A. p = m + v
- B. p = m × v
- C. p = m / v
- D. p = m × a
2. A 2 kg ball travels at 6 m/s. What is its momentum?
- A. 3 kg m/s
- B. 8 kg m/s
- C. 12 kg m/s
- D. 4 kg m/s
3. Why do car airbags reduce injury in a collision?
- A. They reduce the driver's mass
- B. They increase the time over which momentum changes, reducing the force
- C. They increase the driver's velocity
- D. They remove the driver's momentum instantly
4. A 2000 kg truck moving at 5 m/s collides with a stationary 3000 kg car and they lock together. What is their combined velocity immediately after?
- A. 2 m/s
- B. 3 m/s
- C. 5 m/s
- D. 1 m/s
5. Two objects push apart from rest by an internal explosion. Object X (2 kg) moves off at 6 m/s. What must be true of object Y (3 kg)?
- A. It moves at 4 m/s in the same direction as X
- B. It moves at 4 m/s in the opposite direction to X
- C. It remains stationary
- D. It moves at 6 m/s in the opposite direction to X