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Sir,what is frictional force?How does it happens?
Friction is the force which opposes relative motion between two surfaces in contact with each other .
The frictional force always acts tangential to the surface of contact and it is due to surface irregularities at molecular scale.

You will find friction everywhere that objects come into contact with each other. The force acts in the opposite direction to the way an object wants to slide. If a car needs to stop at a stop sign, it slows because of the friction between the brakes and the wheels.
It is due to the existence of friction that we can walk on the ground , trains can run on rails.In the absence of friction we cannot hold a pen or stop our vehicles.Nails and screws join two surfaces due to the force of friction.Without friction it is impossible to climb a tree or fix a nail on the wall.In fact life becomes impossible if there is no friction in nature.So friction is a necessary evil.


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