Work : - Work is said to be done when the point of application of a force moves.

Power : - Power is defined as the rate of doing work.

Energy : - An object having a capability to do work is said to possess energy.

Kinetic Energy : - The energy possessed by the body due to its motion is termed as kinetic energy.

Potential Energy : - The energy possessed by the body due to change of position or shape is termed as potential energy.

Gravitational Potential Energy : - The energy due to the work done against gravity is known as gravitational potential energy.

Elastic Potential Energy : - The energy possessed by a body due to change in the shape of an object is called elastic potential energy.

Mechanical Energy : - The kinetic energy and potential energy together are referred as mechanical energy.

Transformation of Energy : - The change of one form of energy into another form of energy is known as transformation of energy.

Conservation of Energy : - Energy can only be converted from one form to another; it can neither be created nor destroyed.