Movement of an object suspended from a pulley




Movement on the pulley

Two objects are connected by a string on a fixed, frictionless pulley and are moving together. In this case, the mass of the string and pulley is ignored.

Movement on the Pulley

Since tension T and gravity g act in opposite directions on an object with mass m and M, the equation of motion is:
Tmg=ma,MgT=Ma
From the above two equations, the acceleration a, and tension T of the object can be obtained as:
a=MmM+mg,T=2MmM+mg

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