68th BPSC Prelims (2023), question 109

🔬 Science & Technology

  1. Ball bearings are used to convert static friction into

    1. drag
    2. sliding friction
    3. rolling friction
    4. More than one of the above
    5. None of the above
    Show answer

    Answer: C — rolling friction

    Ball bearings convert sliding friction into much smaller rolling friction.

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