Free-body diagrams and Newton's laws Quiz
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5 questions, one answer each
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1. A 5.0 kg object has a resultant force of 20 N. What is its acceleration?
- A. 4.0 m s⁻²
- B. 0.25 m s⁻²
- C. 100 m s⁻²
- D. 25 m s⁻²
2. What is the weight of a 3.0 kg object (g = 9.81 N kg⁻¹)?
- A. 0.31 N
- B. 3.0 N
- C. 29 N
- D. 9.81 N
3. A parachutist falls at constant velocity. What is the resultant force on the parachutist?
- A. Downwards and equal to the weight
- B. Upwards and equal to the drag
- C. Downwards and equal to the drag
- D. Zero
4. The Earth pulls on a satellite. What is the Newton's third law pair of this force?
- A. The satellite's acceleration
- B. The satellite's weight on the satellite
- C. The pull of the satellite on the Earth
- D. The centripetal force on the Earth
5. In the free-fall experiment, which graph has a gradient of g/2?
- A. h against t
- B. h against t²
- C. t against h
- D. h² against t