For each of the materials whose stress-strain graphs are shown in Figure, deduce the values of the Young modulus.

Stress-strain graphs for three materials.

Figure shows force-extension graphs for two materials. For each of the following questions, make the statement required. Also explain how you deduce your answer from the graphs.

Force-extension graph for two polymers.

(a) State which polymer has the greater stiffness.

Figure shows force-extension graphs for two materials. For each of the following questions, make the statement required. Also explain how you deduce your answer from the graphs.

Force-extension graph for two polymers.

(b) State which polymer requires the greater force to break it.

Figure shows force-extension graphs for two materials. For each of the following questions, make the statement required. Also explain how you deduce your answer from the graphs.

Force-extension graph for two polymers.

(c) State which polymer requires the greater amount of work to be done in order to break it.

Which force is caused by a difference in pressure?

(A) Drag

(B) Friction

(C) Upthrust

(D) Weight

Two wires $\mathrm{P}$ and $\mathrm{Q}$ both obey Hooke's law. They are both stretched and have the same strain. The Young modulus of $\mathrm{P}$ is four times larger than that of $\mathrm{Q}$. The diameter of $\mathrm{P}$ is twice that of $\mathrm{Q}$. What is the ratio of the tension in $\mathrm{P}$ to the tension in $\mathrm{Q}$ ?

(A) $\frac{1}{2}$

(B) $1$0

(C) $2$

(D) $16$