Atwood's machine

noun
At·wood's machine | \ ˈat‧ˌwu̇dz- \

Definition of Atwood's machine 

: an apparatus for demonstrating the laws of accelerated motion by means of a light nearly frictionless pulley wheel over which passes a thread having at its ends fairly heavy masses whose slight difference in weight is the cause of the acceleration

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History and Etymology for Atwood's machine

after George Atwood †1807 English mathematician, its inventor

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