_____________ are being used in fans and bicycles to ____________ friction.
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Since the rolling friction is smaller than the sliding friction, sliding is replaced in most machines by rolling by the use of ball bearings. Common examples are the use of ball bearings between hubs and the axles of ceiling fans and bicycles (Fig. 12.16). You know that air is very light and thin.
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ball bearings to reduce friction
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in cycles the wheel and the handle have them
in fans the motors and the blade's connections have them
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