Multiple choice

Ball bearings are used in cycles and scooters to

  1. reduce the area of contact between the two surfaces in contact

  2. reduce friction between wheel and axle

  3. increase friction between wheel and axle

  4. reduce friction between ground and vehicle

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ball bearings convert sliding friction into rolling friction. Rolling friction is significantly lower than sliding friction, which makes movement easier and reduces wear on the axle.

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