Physics (AS & A Level) · May / June 2020 · Paper 11 · Question 21

A tensile force is applied to an unstretched rubber band, causing it to stretch. The tensile force is then removed. Which statement about the rubber band must be correct?

1. AIf the rubber band stretches elastically and plastically, all the work done by the force is converted to thermal energy in the rubber.
2. BIf the rubber band stretches elastically, it obeys Hooke's law.
3. CIf the rubber band stretches elastically, the gradient of the force–extension graph represents the work done by the force.
4. DIf the rubber band stretches plastically, the rubber band will be longer after the force is removed than it was before the force is applied.

As printed in the paper