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Surface Tension — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsSurface Tension1 Mark
Question
Assertion : Work done by friction on a body sliding down an inclined plane is positive.
Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.
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Answer

(e) When a body slides down on inclined plane,workdonebyfrictionisnegativebecauseitopposesthe motion ( $\theta=180^{\circ}$ between force and displacement)

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