In everyday life, we push or pull things to move them. A push or pull is called force. This force helps us to do many things. It can make an object move. It can stop a moving object. It can change the shape of an object, change the speed of the moving object and change the size of the object. There are different types of forces that act on a body.

When you throw a ball up, no matter how high it goes, it is sure to come down. This is because of gravitational force. This force attracts objects to the center of the earth.

When two objects touch each other, a special type of force develops between them. This special force is called friction. Friction slows down movements. When friction is very less, things move easily. When frictions is more, it becomes difficult to move things. A wet floor is slippery because there is very little friction. Friction makes it possible for you to write. You cannot hold a pencil in your hand without friction. It would slip out from your hands. The pencil cannot make a mark on the paper without friction.