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NCERT VIII - Sciences Give examples to show that friction is both a friend and a foe. |
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Answer» n as friend:- We NEED friction to walk on the floor- the WHEELS of vehicles need friction to roll on the roads- friction is needed while climbing a treeFriction as foe:- friction between parts of MACHINES decreases their EFFICIENCY- it produces a lot of noise and WASTES energy- The life of machines is degraded. |
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