Two unequal weights are connected by a massless string which passes over a frictionless pulley.If the pulley has no appreciable mass,the tension in the string is the same on both sides of the pulley;but if the pulley has mass,the tension will not be the same on both sides of the pulley.

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Quizplus · Accepted Answer

This is true as the mass of the pulley will add an additional force which will affect the tension in the string on either side of the pulley, making it unequal.

Two Unequal Weights Are Connected by a Massless String Which