Physics 9702 · AS & A Level · Elastic and plastic behaviour
Elastic and plastic behaviour — practice question
Opposite ends of a copper rod are pulled in tension, causing the rod to extend. Fig. 5.1 shows how the rod’s strain varies with stress.
(a(i))[3]
From Fig. 5.1, find the Young modulus of copper.
(a(ii))[1]
On Fig. 5.1, sketch the line that shows how the rod’s strain changes with stress as the stress falls from $2.5 \times 10^{6}\,\text{Pa}$ to zero. No further calculations are required.
(b)[3]
From Fig. 5.2, explain why the walls of the tyres become warm.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Young modulus is given by $E=\frac{\text{stress}}{\text{strain}}$” …