Momentum Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What is the equation for momentum?
- A. p = m ÷ v
- B. p = m × v
- C. p = F × t
- D. p = ½mv²
2. A 5 kg object moves at 4 m/s. What is its momentum?
- A. 1.25 kg m/s
- B. 9 kg m/s
- C. 20 kg m/s
- D. 40 kg m/s
3. Why does an airbag reduce injury in a crash?
- A. It reduces the change in momentum
- B. It increases the time over which momentum changes, reducing force
- C. It increases the force on the passenger
- D. It has no effect on force
4. In a closed system with no external forces, what happens to total momentum in a collision?
- A. It always increases
- B. It always decreases to zero
- C. It is conserved
- D. It depends on the material
5. A 1200 kg car travelling at 20 m/s crashes and stops in 0.4 s. What is the magnitude of the average force on the car?
- A. 6000 N
- B. 24 000 N
- C. 30 000 N
- D. 60 000 N