Think about a work that you do almost
everyday. Find out if friction helps to get
that work done easily or does it makes
the work harder? Give reason.
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If you observe the application of friction from a frame fixed to any one of the surfaces on which friction is acting, work can never be positive. Friction, by its nature, always acts opposing the relative motion between two surfaces. work done by friction can be zero, when there is no relative motion.
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