Work, Energy and Power Summary

The essential conditions to be satisfied for work to be done are:

Some force must act on the object.

The point of application of force must move in the direction of force.

W = F x s

SI unit of work is joule.

Energy is the capacity to do work.

The two types of mechanical energy are kinetic energy and potential energy.

Kinetic energy is the energy possessed by an object by virtue of its motion.

Potential energy is the energy possessed by an object by virtue of its position or condition.

Kinetic energy = 1/2 mv²

Potential energy = mgh

Law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.

Power is the rate of doing work.

SI unit of power is watt.

Escape velocity is the minimum velocity with which a projectile is thrown into space in order that it escapes the gravitational pull of the earth and never returns to the surface of the earth.