When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
Correct answer: D. maximum
- A. zero
- B. minimum
- C. infinity
- D. maximum
Explanation
Work is W = Fs cos θ. When the force is parallel to displacement, θ = 0° and cos 0° = 1, so W = Fs, the maximum possible work for fixed force and displacement. The likely wrong choice is a because zero work occurs when the force is perpendicular to the motion, not parallel to it.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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