When a force is perpendicular to the direction of motion of the body, then work done on the body is:
Correct answer: A. zero
- A. zero
- B. minimum
- C. infinity
- D. maximum
Explanation
(a) Correct! If the force is perpendicular (θ = 90°) to the displacement, the work done is W = Fd cos θ = 0.(b) Not always true. Work can be minimum depending on the magnitude of the force and displacement.(c) Not applicable. Work is a scalar quantity and cannot be infinite.(d) Incorrect. As mentioned above, work done is zero when the force is perpendicular to the displacement.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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