Mention two points on, why increasing friction is necessary sometimes.
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In many situations friction needs to be increased. 1) By making the moving surfaces rough : Tyres of vehicles have designed with grooves on the surface to increase friction. A large friction provides a better grip to vehicles on the road and prevents them from skidding.
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1) A large friction provides a better grip to vehicles on the road and prevents them from skidding.
2) By increasing roughness of surfaces : The surface of a matchbox and the head of a matchstick are deliberately made rough to increase friction.
3) During Rains the ground become slippery.
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