Hooke’s Law states that if a spring is not stretched beyond its elastic limit, the force that acts on it is directly proportional to the extension of the spring.
The elastic limit of spring is defined as the maximum force that can be applied to a spring such that the spring will be able to be restored to its original length when the force is removed.
The equation derived from Hooke’s Law
It is a measure of the stiffness of a spring or elastic object.
Area below the graph = Work done
For example, the stiffness of spring A is greater than spring B.