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Work and Energy — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceWork and Energy2 Marks
Question
The work done by a force acting obliquely is given by the formula: $\text{W} =\text{F}\cos\theta\times\text{s}.$ What will happen to the work done if angle between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant?
✓

Answer

The work done will decrease as the angle between the direction of force and direction of motion is increased gradually because,
$\text{W} =\text{F}\cos\theta\times\text{s}.$
And $\cos\theta$ decreases as the angle $\theta$ is increased.

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