What is the Law of Conservation of Energy?

[henry]

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed. For instance, in a pendulum, potential energy converts to kinetic energy and vice versa during its swing.

 

[BarryRaymo]

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed or transferred from one form to another. The total amount of energy in a closed system remains constant, even though energy may change forms—for example, from kinetic to potential or to heat.