Exam-style question
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Which of the following best describes the relationship between the applied force and the extension of a metal rod within the elastic limit?.
- A.The extension is proportional to the applied force.
- B.The extension is proportional to the square of the applied force.
- C.The extension is independent of the applied force.
- D.The extension is inversely proportional to the applied force.
Model answer
What a good answer should say
- The extension is proportional to the applied force.
Explanation
Why this works
Within the elastic limit, Hooke’s law applies: F = k ΔL, meaning the extension ΔL is directly proportional to the applied force F. This proportionality is the basis for determining Young’s modulus.
Common mistake
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