Question

what is force of friction

Answer 1

The force acting along the two surfaces in contact which opposes the motion of one object over the other is called force of friction.
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Answer 2

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

Ff is the resistive force of friction. μ is the coefficient of friction for the two surfaces (Greek letter "mu") N is the normal or perpendicular force pushing the two objects together. μN is μ times N
example of frictional force

Rubbing both hands together to create heat. A sled sliding across snow or ice. Skis sliding against snow. A person sliding down a slide is an example of sliding friction.