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Physics (AS & A Level) · Oct / Nov 2019 · Paper 13 · Question 20

9702Elastic and plastic behaviour

The diagram shows a force–extension graph for a rubber band as the band is extended and then the stretching force is decreased to zero. What can be deduced from the graph?

  1. AThe rubber band does not return to its original length when the force is decreased to zero.
  2. BThe rubber band obeys Hooke’s law for the extensions shown.
  3. CThe rubber band remains elastic for the extensions shown.
  4. DThe shaded area represents the work done in extending the rubber band.

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Correct answer: C. The rubber band remains elastic for the extensions shown.

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