Elastic strain energy Quiz
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5 questions, one answer each
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1. A spring obeying Hooke's law is extended by 0.10 m by a force of 6.0 N. How much elastic strain energy is stored?
- A. 0.30 J
- B. 0.60 J
- C. 0.060 J
- D. 60 J
2. The extension of a spring is doubled while it still obeys Hooke's law. The stored energy becomes:
- A. twice as much
- B. three times as much
- C. four times as much
- D. half as much
3. A spring of constant 500 N m⁻¹ compressed by 0.020 m launches a 0.050 kg trolley horizontally on a smooth track. What is the speed of the trolley?
- A. 0.63 m s⁻¹
- B. 2.0 m s⁻¹
- C. 4.0 m s⁻¹
- D. 0.14 m s⁻¹
4. What does the area between the loading and unloading lines on the force–extension graph of a stretched metal wire represent?
- A. Elastic strain energy recovered
- B. Energy transferred as thermal energy during plastic deformation
- C. The spring constant
- D. The stress at the elastic limit
5. A regenerative braking system stores 70% of a vehicle's kinetic energy of 5.0 × 10⁵ J and returns 80% of what is stored. How much energy is returned to the vehicle?
- A. 3.5 × 10⁵ J
- B. 2.8 × 10⁵ J
- C. 4.0 × 10⁵ J
- D. 1.0 × 10⁵ J