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2014-07-28T21:52:24+05:30

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Perfectly smooth surface means that the friction acting on the body is almost negligible. 
The two components of force acting perpendicularly & tangentially cancels each other hence no net force acts on the body.

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2014-07-29T09:55:49+05:30
Since the body is moving through a smooth surface there will only be less friction between the body and the suurface. So no net force will act on the body.
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