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conservation of momentum

noun
1.
the principle that the total linear or angular momentum in any isolated system is constant, provided that no external force is applied
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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conservation of momentum in Science
conservation of momentum  
A conservation law stating that the total linear momentum of a closed system remains constant through time, regardless of other possible changes within the system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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