Work done by a force on an rigid object having no rotationa…

Physics System of Particles Rotational Motion Kinetic Energy, Work and Power MCQ (Single Correct)

Work done by a force on an rigid object having no rotational motion will be zero, if -

the force is always perpendicular to acceleration of object.

the object is at rest relative to ground but the point of application of force moves on the object.

the force is always perpendicular to velocity of object.

the point of application of force is fixed relative to ground by the object moves.

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(b, c)

If velocity and acceleration are not in same direction. Work done by force perpendicular to acceleration will not be zero. If the object is at rest no force can do work.

If force is perpendicular to velocity work done will be zero.

If the point on the body has velocity component in direction of application of force work done will be non-zero.

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