GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It decreases
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It increases
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It stays the same
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It is zero all throughout.
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Detailed explanation-1: -It is clear from the above expression that as the measure of the angle increases, the value of its cos component will decrease, and hence, work done shall also decrease.
Detailed explanation-2: -When cos = 90°, the value of cos is zero and so the work done is always zero. Q. Whenever angle () between the force and the displacement is obtuse, i.e., 90∘<<180∘, the work done is negative.
Detailed explanation-3: -The angle should be 90∘ between force and displacement, for the work to be zero.
Detailed explanation-4: -Zero work is done when the displacement of a body is zero or perpendicular (=900, cos=0) to the direction of force applied, then work done is zero.
Detailed explanation-5: -Expert-Verified Answer When angle between force and displacement is more than 90°, the work done is negative because value of cos is negative for more than 90°.