Exam-style question
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A wire stretches by 2 mm when a force of 100 N is applied. If the original length of the wire is 1 m, what is the tensile strain?.
- A.0.002
- B.0.02
- C.0.2
- D.0.0002
Model answer
What a good answer should say
- 0.002.
- the correct option
Explanation
Why this works
The correct answer is 0.002. This supports Calculate Young modulus from stress and strain.
in The Young modulus because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
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