Conservation of energy Quiz
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5 questions, one answer each
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1. A 0.50 kg ball falls from rest through 5.0 m with no air resistance. What is its kinetic energy just before landing? (g = 9.81 N kg⁻¹)
- A. 2.5 J
- B. 9.9 J
- C. 25 J
- D. 12 J
2. A trolley of mass 2.0 kg moves at 3.0 m s⁻¹. What is its kinetic energy?
- A. 6.0 J
- B. 9.0 J
- C. 18 J
- D. 3.0 J
3. A pendulum bob is released from rest 0.45 m above the lowest point. What is its speed at the lowest point? (g = 9.81 m s⁻²)
- A. 3.0 m s⁻¹
- B. 2.1 m s⁻¹
- C. 4.4 m s⁻¹
- D. 9.0 m s⁻¹
4. A cyclist freewheels down a hill at constant speed. Which statement is correct?
- A. Kinetic energy increases
- B. No work is done against resistive forces
- C. Total energy decreases
- D. Gravitational potential energy lost is dissipated as thermal energy
5. A ball is dropped from 2.0 m and rebounds to 1.5 m. What fraction of its energy is dissipated in the impact?
- A. 50%
- B. 75%
- C. 25%
- D. 33%