Will the total work done by friction on a system be always zero if friction is static and internal to the system? Explain if possible by man boat problem as system and no friction is being provided by water to boat. Friction only exists between man and boat and man is walking without skidding to the other end.
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The man and the boat represent an isolated system. When the man walks on the boat, the frictional force also acts on the boat as a reaction force. Since the action AND reaction happen together at the same place, there can be no net work done.
Sam
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