Atwood\'s machine

Atwood's machine

noun Physics.
a device consisting of two unequal masses connected by a string passed over a pulley, used to illustrate the laws of motion.

Origin:
named after George Atwood (1746–1807), English mathematician who invented it
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Atwood's machine is always a great word to know.
So is radiant energy. Does it mean:
the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum
energy transmitted in wave motion, especially electromagnetic wave motion
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