Hooke's law and force-extension graphs Quiz
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5 questions, one answer each
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1. A spring extends by 40 mm when a force of 6.0 N is applied. What is its stiffness?
- A. 150 N m⁻¹
- B. 0.15 N m⁻¹
- C. 240 N m⁻¹
- D. 6.7 × 10⁻³ N m⁻¹
2. A wire is loaded beyond its elastic limit and then unloaded. Which statement is correct?
- A. It returns to its original length
- B. It has a permanent extension
- C. Its extension is directly proportional to the force
- D. It has broken
3. What does the gradient of the straight part of a force–extension graph represent?
- A. The extension
- B. The work done
- C. The stiffness
- D. The yield point
4. Which describes the yield point?
- A. The material returns to its original length
- B. A large extension occurs for little or no increase in force
- C. The material breaks
- D. Force is proportional to extension
5. A spring obeys Hooke's law with k = 500 N m⁻¹. It is compressed by 2.4 cm. What force is needed?
- A. 12 N
- B. 1.2 × 10⁴ N
- C. 0.048 N
- D. 21 N