The product of force and displacement.
The ability to do work.
The energy an object has due to it's motion.
The energy an object has due to its position relative to other objects.
The sum of kinetic and potential energy in an object.
The energy that comes from friction and heat.
The total energy of an isolated system remains constant. This law means that energy can neither be created nor destroyed.
The rate at which work is done or energy is transferred.
Since work is equal to force times distance,
Velocity is equal to distance over time, thus,
Energy cannot be created nor destroyed, but it can be transformed from one type to another, and from one system to another.
Figure: As the board travels down the ramp, its energy is transformed from potential energy to kinetic energy and thermal energy. The magnified view of the skateboard and ramp demonstrates that a small amount of thermal energy is transferred from the board to the ramp as it rolls along its surface.