It changes the relative positions of constituent particles in the crystal lattice. As soon as that happens, the interatomic or intermolecular forces come into play and they, tend to restore the solid back to it's original shape. This restoring force per unit area is called Stress. When external forces are removed, the internal forces tend to restore the solid back.
This property is called Elasticity. However, no material is perfectly elastic and what happens is that, the body is not able to restore itself completely. How does force change the shape of an object?
A metal drinks can undergoes inelastic deformation when it is squashed. Change of shape When a force acts on an object, the object may change shape by bending, stretching or compressing - or a combination of all three shape changes. However, to change the shape of a stationary object there must be more than one force acting to do the following: Bend an object's ends past each other, eg when an Olympic diver stands on the end of a diving board.
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