Impulse and force-momentum change Quiz
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5 questions, one answer each
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1. Which unit is equivalent to the newton second?
- A. kg m s⁻²
- B. kg m s⁻¹
- C. kg m² s⁻¹
- D. J s⁻¹
2. A force of 20 N acts on a body for 0.50 s. What is its change in momentum?
- A. 10 kg m s⁻¹
- B. 20 kg m s⁻¹
- C. 40 kg m s⁻¹
- D. 0.025 kg m s⁻¹
3. A 0.40 kg ball hits a wall at 6.0 m s⁻¹ and rebounds at 4.0 m s⁻¹. What is the change in momentum?
- A. 0.80 kg m s⁻¹
- B. 2.0 kg m s⁻¹
- C. 4.0 kg m s⁻¹
- D. 1.6 kg m s⁻¹
4. A cricketer lowers his hands while catching a ball. Why does this reduce the force on his hands?
- A. It decreases the momentum of the ball
- B. It increases the time over which the ball stops
- C. It increases the mass of the ball
- D. It increases the speed of the ball
5. A 2.0 kg trolley accelerates from 1.0 m s⁻¹ to 4.0 m s⁻¹ in 3.0 s. What is the average resultant force?
- A. 1.0 N
- B. 2.0 N
- C. 3.0 N
- D. 6.0 N