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Mention two methods of reducing friction...

Mention two methods of reducing friction.

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(a) Lubricating machinery parts with oil, grease etc. reduces friction.
(b) Polishing and powdering the same reduces force of friction on dancing floors, billiard and snooker boards etc.
(c ) Aerodynamics shape of bodies produces less air friction and water friction in vehicles and aquatic animals.
(d) Ball bearings and roller bearings reduce rolling friction.
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