The action of external forces on an object that is not moving causes strain and stress on the object. Strain is defined as the deformation and displacement that the object experiences whereas stress is defined as the resisting forces that take place in the object. The deformation that happens on an object is measured through a device known as a strain gauge. In order to know the amount of deformation that has taken place, you should divide the deformation of the initial length of the object by the initial length of the object.
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