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it says that when a person uses a staircase
friction is worn out between the soles of his shoes and the stairs
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Answer:
Friction 'wears out' ( damages) the steps of stair cases and foot over buildings.
*friction is something that doesn't happen in smooth manner because friction itself is against force.
*But for a motion to happen ,there must be friction and hence there would be damage in steps
*this damage due to friction can be reduced by using lubricant s
Hope this would have helped (◠‿・)—☆
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