Physics (AS & A Level) · Oct / Nov 2021 · Paper 13 · Question 21

A metal wire is stretched to breaking point and the force–extension graph is plotted. Which graph is correctly labelled with the elastic region, the plastic region and the area representing the work done to stretch the wire until it breaks?

1. AGraph A: elastic region labelled on initial linear part, plastic region labelled on curved part, work done shaded under initial linear region only
2. BGraph B: plastic region labelled on initial linear part, elastic region labelled on curved part, work done shaded under entire curve
3. CGraph C: elastic region labelled on initial linear part, plastic region labelled on curved part, work done shaded under entire curve
4. DGraph D: elastic region labelled on initial linear part, plastic region labelled on curved part, work done shaded under entire curve

As printed in the paper