Exam-style question
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In a stress-strain graph, what does the area under the curve represent?.
- A.The elastic potential energy stored in the material.
- B.The tensile strength of the material.
- C.The yield point of the material.
- D.The modulus of elasticity.
Model answer
What a good answer should say
- The elastic potential energy stored in the material.
Explanation
Why this works
The evidence is the area under the stress-strain curve, which quantitatively represents the work done on the material as it is deformed. This area corresponds to the elastic potential energy stored.
The implication is that this energy can be recovered if the material is not permanently deformed. Thus, we conclude that the area under the curve indicates the elastic potential energy.
Common mistake
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