Newton's laws of motion Quiz
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5 questions, one answer each
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1. A car moves at a steady 20 m/s along a straight road. What is the resultant force on it?
- A. Forwards, equal to the driving force
- B. Backwards, equal to the friction
- C. Zero
- D. Equal to the weight of the car
2. A resultant force of 6.0 N acts on a 2.0 kg trolley. What is its acceleration?
- A. 0.33 m/s²
- B. 3.0 m/s²
- C. 12 m/s²
- D. 4.0 m/s²
3. The same resultant force acts on a 1 kg trolley and a 4 kg trolley. Which statement is correct?
- A. The 1 kg trolley accelerates four times as much
- B. The 4 kg trolley accelerates four times as much
- C. Both trolleys accelerate equally
- D. The 1 kg trolley accelerates twice as much
4. When you walk forwards, which force is the third law pair of your foot pushing backwards on the ground?
- A. Your weight acting downwards
- B. The ground pushing you forwards
- C. Air resistance pushing you backwards
- D. The ground pushing you upwards
5. Why do passengers move forwards when a car brakes suddenly?
- A. The car pushes them forwards
- B. Their mass decreases
- C. A braking force acts on them
- D. Inertia: they keep moving at the same velocity unless a force acts