Space and Time: Inertial Frames - Stanford Encyclopedia of …
https://plato.stanford.edu/archIves/spr2010/entries/spacetime-iframes/
WEBMar 30, 2002 · The laws of Newtonian dynamics provide a simple definition: an inertial frame is a reference-frame with a time-scale, relative to which the motion of a body not subject to forces is always rectilinear and uniform, accelerations are always proportional to and in the direction of applied forces, and applied forces are always met with equal and ...
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