Impulse and force-momentum Quiz
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5 questions, one answer each
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1. A constant force of 20 N acts on an object for 0.50 s. What is the change in momentum?
- A. 40 kg m s⁻¹
- B. 0.025 kg m s⁻¹
- C. 10 kg m s⁻¹
- D. 20.5 kg m s⁻¹
2. A 0.40 kg ball moving at 5.0 m s⁻¹ hits a wall and rebounds at 3.0 m s⁻¹. What is the magnitude of the change in momentum?
- A. 0.80 kg m s⁻¹
- B. 1.2 kg m s⁻¹
- C. 2.0 kg m s⁻¹
- D. 3.2 kg m s⁻¹
3. A force of 600 N acts on an object for 20 ms. What is the impulse?
- A. 12 N s
- B. 3.0 × 10⁴ N s
- C. 12 000 N s
- D. 0.033 N s
4. Why do crumple zones reduce injury in a collision?
- A. They reduce the car's mass
- B. They increase the time of the collision so the average force is smaller
- C. They reduce the change in momentum of the passengers
- D. They stop the car instantly
5. In the core practical, a graph of impulse against change in momentum should be:
- A. A curve with a decreasing gradient
- B. A horizontal line
- C. A straight line with gradient 1 through the origin
- D. A straight line with gradient equal to the trolley's mass