ballistic-pendulum

ballistic pendulum

noun Physics.
a device consisting of a large mass hung from a horizontal bar by two rods, used to measure the velocity of an object, as a bullet, by retaining the object upon impact, its velocity being a function of the displacement of the mass.

Origin:
1770–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
ballistic pendulum

noun
a physical pendulum consisting of a large mass suspended from a rod; when it is struck by a projectile its displacement is used to measure the projectile's velocity 
WordNet® 3.0, © 2006 by Princeton University.
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