Define the different types of forces.

Force can act on a body from a distance or by being in contact with it. Depending on this, forces can be classified as contact and non-contact forces.

(a) Contact forces: When force is applied on an object by direct or indirect physical contact the applied force is called contact force. Muscular and frictional force are example of contact force.

Muscular force: The force resulting due to the action of muscles is known as the muscular force.

Frictional force: The force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

(b) Non-contact forces: When a force is applied to an object by another body that is not in direct contact with it is called non-contact force. Gravitational, magnetic and electrostatic force are example of non-contact force.

Gravitational force: The attractive force of the earth which acts upon all the objects is known as the force of gravity or just gravity.

Electrostatic force: The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

Magnetic force: The force exerted between a magnet and other magnet or magnetic material is known as magnetic force.