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conservation of linear momentum

American  

noun

Physics.

  1. the principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.