Elasticity and Hooke's law Quiz
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5 questions, one answer each
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1. A spring has k = 40 N/m. What force gives an extension of 0.25 m (within the limit)?
- A. 10 N
- B. 160 N
- C. 0.00625 N
- D. 65 N
2. A spring extends by 5 cm under a 10 N load. What is its spring constant?
- A. 2 N/m
- B. 50 N/m
- C. 200 N/m
- D. 0.5 N/m
3. What does the gradient of the straight part of a force-extension graph represent?
- A. The energy stored
- B. The spring constant
- C. The natural length
- D. The extension
4. A wire is stretched beyond its elastic limit and the force is then removed. What happens?
- A. It returns exactly to its original length
- B. It becomes shorter than its original length
- C. It becomes stronger
- D. It stays permanently stretched
5. What happens to energy when a spring is stretched?
- A. It is stored as elastic potential energy
- B. It is destroyed
- C. It is stored as chemical energy
- D. It becomes gravitational potential energy