Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.
Forces that act on a solid object affects the spacing of atoms within the solid to a small extent. This change in spacing changes the external structure or shape and size of the solid, and it is termed as deformation of solids.