Work done will be maximum if the angle between the force F and displacement d is______________________?
Correct answer: D. 0°
- A. 45°
- B. 90°
- C. 180°
- D. 0°
Explanation
Work is W = Fd cos θ. For fixed force and displacement, cos θ is greatest at θ = 0°, where W = Fd, so the work is maximum. Students may choose 90° because it is important in force questions, but at 90° the work is zero, not maximum.
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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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