The two main categories of energy are _ energy (stored energy) and _ energy (energy presently doing work or causing change).

Potential energy (stored energy)

Kinetic energy (energy presently doing work or causing change)

Potential energy is the energy in a body due to its position. It is the energy possessed by a body by virtue of its position or state. For example water at the top of the waterfall before the precipice.

While kinetic energy is the energy in a body due to its motion. Kinetic energy is energy possessed by a body by virtue of its movement. For example: Flowing water, such as when falling from a waterfall.