Work, energy and the conservation of energy Quiz
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5 questions, one answer each
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1. A force of 50 N pulls a trolley 8.0 m. The force acts at 60° to the direction of motion. What work is done by the force?
- A. 400 J
- B. 346 J
- C. 200 J
- D. 25 J
2. What is the kinetic energy of a 1200 kg car travelling at 15 m s⁻¹?
- A. 9.0 × 10³ J
- B. 1.8 × 10⁴ J
- C. 2.7 × 10⁵ J
- D. 1.35 × 10⁵ J
3. A 2.0 kg object falls from rest through 5.0 m with negligible air resistance. What is its speed on landing?
- A. 7.0 m s⁻¹
- B. 9.9 m s⁻¹
- C. 49 m s⁻¹
- D. 98 m s⁻¹
4. A box is pushed at constant speed across a rough floor. What happens to the work done by the person?
- A. It is transferred as thermal energy through friction
- B. It is stored as kinetic energy
- C. It is stored as gravitational potential energy
- D. It is destroyed
5. A 0.50 kg ball is thrown vertically upwards at 12 m s⁻¹. Ignoring air resistance, what is the maximum height?
- A. 0.61 m
- B. 3.7 m
- C. 7.3 m
- D. 14.7 m