State The Law Of Conservation Of Energy?

The law of conservation of energy states that energy cannot be created or destroyed. It can be converted from one form to another but the sum of all the energy in the universe is a fixed constant amount. It can never be any more or less.
Energy is what enables change. It is often defined as the ability to do work. To make work easier, we change one form of energy into another. There are many forms of energy such as light, heat and sound. But all energy has to be either kinetic or potential. The basic unit of energy is the joule.

Scientists now think they have discovered a new form of energy (they have named "dark energy"). It is supposed to have strong negative pressure and it is believed that this is what is causing the universe to expand and grow!