Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 20

A scientist is investigating the properties of a new material. She plots a force-extension graph for the material up to its breaking point. Which statement must be correct?

1. AThe area under the graph from P to R is the strain energy stored in the material.
2. BThe area under the graph from P to R is the work done in stretching the material.
3. CThe material stretches elastically from Q to R.
4. DThe material stretches plastically from P to Q.

As printed in the paper