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Work, Energy, and Power — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
Question
Is work done by a non conservative force always negative? Comment.
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Answer

No. For example, work done by a non-conservative force like friction is zero, so long as the body does not start moving. Again when friction causes motion, work done by friction is positive.

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