Forces & Energy Quiz
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5 questions, one answer each
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1. What is the equation for work done?
- A. A. W = F / d
- B. B. W = F x d
- C. C. W = m x g x h
- D. D. W = 1/2 m v^2
2. A car's speed increases from 20 m/s to 40 m/s. By what factor does its kinetic energy increase?
- A. A. 2
- B. B. 4
- C. C. 8
- D. D. 16
3. Which equation correctly gives gravitational potential energy?
- A. A. E_p = m x v
- B. B. E_p = m x g x h
- C. C. E_p = 1/2 x k x e^2
- D. D. E_p = F x d
4. A crane does 6000 J of work lifting a load in 20 s. What is its power output?
- A. A. 30 W
- B. B. 120 W
- C. C. 300 W
- D. D. 3000 W
5. A spring is stretched beyond its limit of proportionality. What is the consequence for calculating its elastic potential energy?
- A. A. The equation E_e = 1/2 k e^2 no longer gives an accurate value
- B. B. The spring constant becomes negative
- C. C. No elastic potential energy is stored at all
- D. D. Work done against friction becomes zero