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What are the useful and harmful effect of friction?

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Answer:

Useful effect of friction - automotive clutch , friction material on adjacent plates help give grip the other plate connected to drive shaft , hence allowing the friction to slowly bring the drive shaft up to speed , otherwise the motor would just stall.
Or to give useful grip to tyres on the road.

Harmful effect of friction - makes bearing harder to turn since friction holds on to surface between the bearing and the bearings outer surface

First answer by ID2053806668. Last edit by ID2053806668. Question popularity: 16 [recommend question].

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