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A stress-strain graph is given for a rubber band. Consider the statements: I. It is easier to compress this rubber than to stretch it. II. The rubber does not return to its original length after being stretched. III. The rubber band heats up when it is stretched and then released. Which statements can be deduced from the graph?
- III only
- II and III
- I and III
- I only
Correct answer: II and III
Solution
Rubber shows elastic hysteresis: the unloading curve lies below the loading curve, so it does not regain its original length immediately and the loop area appears as heat.
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