# Thread: If two identical masses

1. ## If two identical masses

If two identical masses are attached by a light cord which is passing over a mass-less, frictionless pulley of an atwood's machine, but at different heights, and then realesed:

1) the masses will not move.
2) the higher mass will go down.
3) the motion will depend on the amount of the masses.
4) the lower mass will go down.

2. Originally Posted by Refujoi
If two identical masses are attached by a light cord which is passing over a mass-less, frictionless pulley of an atwood's machine, but at different heights, and then realesed:

1) the masses will not move.
2) the higher mass will go down.
3) the motion will depend on the amount of the masses.
4) the lower mass will go down.
1) the masses will not move.

You can set up the mathematics for the problem, but we can "logic" this one out. The largest mass in the Atwood machine will accelerate downward. Since the masses are equal there is no acceleration. The height does not matter.

-Dan

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### if two identical masses attached by a light string passing over a light,frictionless pulley of an atwoods machine at different heights are released from the rest.

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