Is the work done by non-conservative forces a | vedclass

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(B) No,the work done by non-conservative forces is not always negative.$1$. If a body is subjected to a force but does not move,the work done by frict

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No,it can be zero or positive depending on the situation.

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(B) No,the work done by non-conservative forces is not always negative.$1$. If a body is subjected to a force but does not move,the work done by friction is zero.$2$. If the motion of a body is caused by friction (e.g.,a block placed on a moving plank),the work done by the friction force on the body can be positive.$3$. Generally,work done by friction is negative when it opposes the relative motion between surfaces,but it is not a universal rule for all non-conservative forces.

Is the work done by non-conservative forces always negative? Discuss.

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