Physics 9702 · AS & A Level · Elastic and plastic behaviour
Elastic and plastic behaviour — practice question
The spring is fixed so that it hangs down vertically, as shown in Fig. 4.1. Various masses are then hung from the bottom end of the spring. For each mass $M$, the extension $x$ of the spring is measured. The way $M$ changes with $x$ is plotted in Fig. 4.2.
(a)[1]
State and explain if the spring follows Hooke’s law.
(b)[1]
State the type of energy stored in the spring because the masses are added.
(c)[1]
Describe a method for checking whether the spring’s extension is elastic.
(d)[3]
Calculate the work done on the spring as it is extended from $x = 40.0\,\text{mm}$ to $x = 160\,\text{mm}$.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Straight line does not pass through origin so force not proportional to extension (not Hooke’s law)” …