There really isn’t a stable definition of energy. But simply, energy is the ability to do work
What’s kinetic energy?
This is the energy possessed by a moving object. This is the work done by accelerating an isolated object from rest to a final velocity. Kinetic energy is equal to half the mass of the object times it’s square velocity
What’s potential energy
This is the energy possessed by a seemingly stationary objected subject to a force (regularly gravitational and elastic). The gravitational potential energy is equal to the object’s mass times gravitational acceleration (about 9.8 meters per second squared) times the vertical height.
Energy exists all around us, but in different forms.
Heat energy, light energy, mechanical energy, nuclear energy, sound energy, you name it.
