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Biological forces, mechanical forces and...

Biological forces, mechanical forces and frictional forces are the examples of:

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Knowledge Check

  • Frictional force causes

    A
    Wear and tear of a machine
    B
    Energy loss in the form of heat
    C
    Motion in a body
    D
    Both (a) and (b)

  • Frictional force causes

    A
    Wear and tear of a machine
    B
    Energy loss in the form of heat
    C
    Motion in a body
    D
    Both (a) and (b)

  • Work done by frictional force

    A
    Is always negative
    B
    Is always positive
    C
    Is zero
    D
    May be positive, negative or zero

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