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inertial system

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noun Physics.
  1. a frame of reference in which a body remains at rest or moves with constant linear velocity unless acted upon by forces: any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system.
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Compare law of motion.

Origin of inertial system

First recorded in 1950–55
Also called inertial reference frame.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for inertial system

inertial system

noun
  1. a frame of reference within which bodies are not accelerated unless acted upon by external forcesAlso called: inertial reference frame
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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