Hooke's Law describes the relationship between the force applied to an unstretched spring and the amount it is stretched. An experiment is conducted to determine how the extension of a spring varies with the stretching force. Weights are added to a spring in stages and the extension is measured. The results show that the extension is directly proportional to the applied force, as predicted by Hooke's Law, but only up to a certain point known as the elastic limit. Beyond this point, the spring undergoes plastic deformation and does not return to its original length when the force is removed.

1. Hook’s Law