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Question
Identify the incorrect statement:
No work is done by a force F on an object if:
Options
the object is stationary but the point of application of force moves on the object.
the object moves in such a way that the point of application of force remains fixed.
the force is always perpendicular to velocity.
The force is always perpendicular to acceleration.
MCQ
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Solution
The force is always perpendicular to acceleration.
Explanation:
No work is done when displacement is zero or when force is perpendicular to displacement/velocity. But a force cannot be always perpendicular to acceleration because, by Newton’s second law, force and acceleration act in the same direction.
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