Friction can be defined as the resistance to the relative motion of surfaces. These surfaces could be solid surfaces or liquid layers, etc. A common example of friction is force that develops between the road and the tire of cars (or other vehicles). This friction resists the motion of tires on road and generates heat, which causes the wear of the tires. Frictional force acts along the interacting surfaces and its direction is opposite to the applied force (that's how it resist motion). Frictional force is directly proportional to the normal force exerted by interacting surfaces on each other and is given as:
`F = muN`
where, `mu` is the coefficient of friction.
We make use of friction in designing vehicle braking systems. Friction can be reduced by use of lubricants or oils.
Hope this helps.
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