What is the energy?

The capacity to do work is called energy.
Energy is a scalar quantity. The dimensional formula of the energy are the same as the dimensional formula of work i.e. [ M1L2T-2 ].
SI unit of energy is joule and CGS unit of energy is erg.

Characteristics of energy

  • The entire matter possesss energy.
  • Energy can neither be created nor be destroyed. The quantity of energy in the universe is constant
  • Energy can be transformed from one form to the other.