11th Class Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank 11th CBSE Physics Work, Energy, Power & Collision

  • question_answer
    Is work done by a non conservative force always negative? Comment.

    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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