Question

Why rubber slippers after some time of usage become slippery ?

Answer 1

t is due to friction.

Friction wears down the rubber soles , thus in the long run the rubber soles suffer from wear and tear.
Hence the slippers become slippery!

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Answer 2

Because of wear and tear of grip of the slippers which results in the reduction of friction between ground and slippers due to which it become slippery.

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