hoe do we eduse friction or increase friction?
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Reduce: 1) By smoothening surfacing by polishing them. 2) Using ball bearings/circular surfaces as 'rolling friction' causes lesser friction. 3) Lubricants or smooth powder ( like graphite dust) can be used to smoothen the surface of contact to reduce friction.
Increase: 1) Make the surfaces in contact more rough. ( not sure of any other way )
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