STD VIII – ENERGY (Online)

Work

Work is done whenever a force moves something over a distance. You can calculate the energy transferred, or work done, by multiplying the force by the distance moved in the direction of the force. Energy transferred = work done = force x distance moved in the direction of the force.

Energy

We cannot imagine the world without energy.  There are various sources of energy available today to the mankind.

The development of science and civilisation is closely linked to the availability of energy in useful forms. Modern society consumes vast amounts of energy in all forms: light, heat, electrical, mechanical, chemical, and nuclear.

Broadly speaking, energy has been divided into two kinds:

Potential energy.

Kinetic energy.

But there are other forms of energy also. Some forms of energy are mechanical energy, which is either in the form of potential energy or kinetic energy or a combination of the both, electrical energy, light energy, heat energy, sound energy, nuclear energy, chemical energy, magnetic energy, etc.