1.30 Understand that the initial linear region of a force-extension graph is associated with Hooke’s law

In a force extension graph, like the one shown below, the linear region demonstrates Hooke's Law. It shows that there is a direct correlation between extension and force applied; they increase at the same rate.

The elastic limit is where the graph curves. It means that when the object reaches this point, it will no longer spring back into its original shape.