Multiple choice

What is the use of ball bearings between hubs and the axle of ceiling fans and bicycle?

  1. To reduce sliding friction

  2. To reduce static friction

  3. Rolling reduces friction

  4. Rolling increases friction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ball bearings reduce friction by converting sliding friction between the hub and axle into rolling friction. The balls roll between the surfaces, dramatically reducing resistance and allowing smooth rotation with less energy loss.

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