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When is work done by a force zero ?...

When is work done by a force zero ?

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Work done by a force is zero if the direction of force and displacement are perpenddicular to each other or if the displacement is zero.
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Knowledge Check

  • When work done by force of gravity is negative, then

    A
    PE increases
    B
    KE increases
    C
    PE remains constant
    D
    PE decrease

  • A body is acted upon by a force. If work done by the force is zero, then which of the following is (are) possible?

    A
    The body moves in such a way that point of application of the force remains fixed
    B
    The body remains stationary but the point of application of the force moves on the object
    C
    The force is always. Perpendicular to its acceleration
    D
    The velocity is always perpendicular to the force

  • the work done by applied force is

    A
    10 J
    B
    50 J
    C
    100 J
    D
    150 J

    • Similar Questions

    Explore conceptually related problems

    How do we calculate work done by a force ? Write any two conditions under which work done by a force is zero.

    Identify the incorrect statement(s) among the following (A) If the total displacement of a particle applied by some force is zero. Then the work done by the force on the particle will be zero. (B) Non conservative force will do negative work always (C) Work done by a constant force on a particle which negotiates closed path in round a trip will be zero (D) Work done by a constant

    Work done by a force is zero when a body gets displaced along a direction ……….. to the direction of applied force .

    A : The work done by a force during round trip is always zero. R : The average value of force in round trip is zero.

    Assertion : When pendulum bob is rotating in a circle around the point of suspension then work done by tension and the weight is zero . Reason : Work done by a force is defined as dot product of force vector and displacement vector .

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