Question

What do u mean by friction?

Answer 1

Answer:

"When two surfaces move together and the resistance offered by these surfaces is called friction. For example when a ball is thrown it moves up till some distance and stops. The ball is acted by an external force and it stops. This external force is referred to as friction. Static friction, Sliding friction, Rolling friction, fluid friction are the four types of friction."

Answer 2

Explanation:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact..

Hope its help..