GyanGram
ATTEMPT · SCIENCE & TECHNOLOGY · PRELIMS 2013
Ball bearings are used in bicycles, cars, etc., because
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Ball bearings are used in bicycles, cars, etc., because
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• Correct Answer: C
• Ball bearings replace sliding friction with rolling friction by reducing effective contact area between wheel and axle to point contacts.
• They do not increase actual or effective contact area; rolling elements minimise friction.
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