FORCE

Our World is full of activity and movement.
The Earth is moving on its axis and around the sun.
The clouds move across the sky.
Aeroplanes fly n the air, ships sail on water. Vehicles move on roads. We Walk, run,leap, jump, and so on. All these happen due to force.We can not sell force, but we can feel it.
What is Force.

A Pull or Push is called force. We use force to move things, and to stop moving things.
The force which we use to do word, is called energy.
FORMS OF FORCE
HEAT FORCE (ENERGY)

We get heat energy from burning things.
Main sources of this energy are wood,coal,gas,oil,diesel and petrol.
Ship aeroplanes, generators and other machines work with this energy.
FORCE OF GRAVITY

Earth has invisible power.
Because of it, the earth works like a magnet.
It pulls everything towards itself. This power is called the force of gravity.
FORCE OF FRICTION


Force of friction appears when two surfacs of things rub together.
When we rub our hands together friction makes our hands hot. When we apply brake,the friction between tyres and the earth stops the movement of the vehicles.