Hooke's law
empirical physical law of mechanics that the force on a spring is proportional to its displacement / From Wikipedia, the free encyclopedia
It is a law of mechanics and physics discovered by Robert Hooke.
This theory of elasticity says the extension of a spring is proportional to the load applied to it. Many materials obey this law as long as the load does not exceed the material's elastic limit. Materials for which Hooke's law is useful are known as linear-elastic or "Hookean" materials.