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Suppose a pulley fixed to ceiling has a block attached at one end and pulley-2 at the other. Pulley-2 has further m1 and m2.Nothing fancy, all strings and pulley are massless. Now suppose the pulley system moves down(beware, no force is applied other than gravitational) with acc = a. What im interested in is why the relative acceleration of the string (or masses) in pulley-2 does not equal net drive over net mass (m2.g - m1.g)/(m1 + m2). And yes, relative being from a frame of reference moving down with a. Is it the pseudo force? can any1 elaborate?


 Suppose a pulley fixed to ceiling has a block attached at one end and pulley-2 at the other. Pulley-2 has further m1 and m2.Nothing fancy, all strings and pulley are massless. Now suppose the pulley system moves down(beware, no force is applied other than gravitational) with acc = a. What im interested in is why the relative acceleration of the string (or masses) in pulley-2 does not equal net drive over net mass (m2.g - m1.g)/(m1 + m2). And yes, relative being from a frame of reference moving down with a. Is it the pseudo force? can any1 elaborate?


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