Friction :
A force acting in the opposite direction to the motion of the body is called force offriction simply friction. It is of the following two types:
1. Static friction; and
2. Dynamic friction.
Static friction :
The friction, experienced by a body, when at rest, is known as static friction
Dynamic friction :
The friction experienced by a body, when in motion, is called dynamic friction. It is also call kinetic friction. It is of the following two types:
(a) Sliding friction; and
(b) Rolling friction.
Sliding friction :
The friction, experienced by a body, when it slides over another body, is known as sliding friction
Rolling friction :
The friction experienced by a body, when balls or rollers are interposed a surfaces known as rolling friction.
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