Forces, Newton's laws and free-body diagrams Quiz
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5 questions, one answer each
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1. A 2.0 kg trolley is acted on by a resultant force of 6.0 N. What is its acceleration?
- A. 3.0 m s⁻²
- B. 12 m s⁻²
- C. 0.33 m s⁻²
- D. 4.0 m s⁻²
2. Which statement about terminal velocity is correct?
- A. The weight is zero
- B. The drag force equals the weight, so the resultant force is zero
- C. The drag force is zero
- D. The acceleration is g
3. Which pair of forces is a Newton's third law pair?
- A. Weight of a book and the contact force from the table on it
- B. Tension in a string and the weight of the object it holds
- C. Drag and weight on a falling object
- D. The Earth's pull on a satellite and the satellite's pull on the Earth
4. An astronaut has a mass of 70 kg. What is her weight where g = 3.7 N kg⁻¹?
- A. 19 N
- B. 70 N
- C. 259 N
- D. 686 N
5. A parcel moves at constant velocity along a level conveyor belt. The resultant force on it is
- A. equal to its weight
- B. in the direction of motion
- C. zero
- D. equal to the friction force