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2015-02-14T15:43:41+05:30

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as a friend: it helps to walk comfortably and to catch things 
as a foe: it reduces the speed of moving objects and not allow the free movement of objects
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2015-02-14T19:38:56+05:30
Friction is a friend 1) grip helps in making a proper balance 2) friction helps to write on blackboard and on all place. friction is a foe it lose the grip of tire
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