Atwood's Machine

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A simple demonstration of Newton's second law is provided by Atwood's machine, which consists of a pulley between two masses. The problem is to calculate the acceleration of the two masses. (Their magnitudes are equal but of opposite sign.) If the masses are equal, the system is in equilibrium and nothing moves.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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Details
The acceleration of the left-hand mass is given by , where
and
are the left- and right-hand masses in kg and
is the acceleration due to gravity. It travels a distance
while the trigger is active (it is stopped when the || button is clicked). The quantities
and
are taken as positive when the left-hand mass moves upward and negative when it moves downward. The time during which the masses are moving before hitting bottom is given by
.
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