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.