A force acting on an object may cause the obejct to change it's shape.
A force applied to an object that's able to recover it's original shape when the force is removed is said to be elastic, e.g a spring
When a force is applied to a spring, work is done in strectching the spring. The energy stored is called elastic potential energy. When the force is removed, the energy stored is used to bring the object back to it's original shape.
For elastic objects, like spring, th extension is directly proportional to the force applied, provided that the limit of proportionality is not exceeded. The equation is as follows:
F = k x e
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