The force acting on objects, when two objects come in contact with each other are known as contact forces.
Examples of contact forces are given below:
1. Muscular Force: Force exerted due to the action of muscles. This force is categorised as contact force because, it comes in play only when an object is being handled.
Example: bending, running, moving etc.
2. Friction: Force exerted on an object when its surface comes in contact with another surface. This force comes into action only when the two surfaces come in contact with each other and hence are called contact forces.