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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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

conservation of momentum in Science

conservation of momentum

  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.