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whenever a body moves or tends to move over the surface of another body, a force comes into play which acts parallel to the surface and opposes the relative motion.
it is important for:
(A) it helps us to walk
(B) without friction an ant could also have moved any heavy machine/thing. etc.
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Unification: It is a trial to correlate and unite various universal laws and basic phenomena of nature to explain an activity. For example Maxwell unified electric, magnetic and optical phenomenon on when he explained that light is an electromagnetic wave.
Reduction: It is the effort to solve a complex problem by breaking it into simpler parts. It is considered to be heart of physics. For example temperature of a system is reduced to average kinetic.

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