Work, energy and conservation of energy Quiz
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5 questions, one answer each
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1. A force of 20 N acts at 60° to the direction in which a box moves 3.0 m. What work does the force do on the box?
- A. 60 J
- B. 52 J
- C. 30 J
- D. 120 J
2. A car of mass 1000 kg doubles its speed from 10 m s⁻¹ to 20 m s⁻¹. By what factor does its kinetic energy increase?
- A. 2
- B. 4
- C. 8
- D. 16
3. A 2.0 kg mass is raised 5.0 m at the Earth's surface. What is the gain in gravitational potential energy?
- A. 10 J
- B. 20 J
- C. 49 J
- D. 98 J
4. A ball is dropped from rest from a height of 20 m. Ignoring air resistance, what is its speed just before hitting the ground?
- A. 20 m s⁻¹
- B. 10 m s⁻¹
- C. 44 m s⁻¹
- D. 14 m s⁻¹
5. A sledge slides across level snow and slows to a stop. Which statement about the work done against friction is correct?
- A. It destroys energy
- B. It transfers kinetic energy to thermal energy in the surroundings
- C. It increases the gravitational potential energy of the sledge
- D. It cannot be calculated