Explain with the help of examples :
Muscular force, gravity, static electric force.
Muscular force: The force applied by the action of muscles in our body is termed as muscular force.
For example, when we pick up a book placed on the table using our hands, we apply muscular force.
Gravity: The Earth attracts everything (that is near or on its surface) towards its centre by a non−contact force known as the gravitational force of the Earth or gravity. It is this force that makes an apple fall towards the ground from the tree and makes the water from a tap flow down.
Static electric force: The frictional force resulting in the development of electrical charges on objects is called static electric force. This force can be observed when a plastic scale rubbed on the hair attracts bits of paper.