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SSC Sample Paper NCERT - Sample Paper-3

  • question_answer
    Ball bearings are used in bicycles, cars, etc. because                                                                                (2013)

    A)  The actual area of contact between the wheel and axle is increased

    B)  The effective area of contact between the wheel and axle is increased

    C)  The effective area of contact between the wheel and axle is reduced

    D)  None of the above statements is correct

    Correct Answer: D

    Solution :

    [d] It reduces the rotational friction between the vehicle and the surface it runs on, such as cemented roads. Friction force is independent of area of contact and proportional to normal force.


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