This web page describes inertial and non-inertial frames of reference, the latter being frames where Newton's laws do not hold. The text explains "fictitious forces", the centrifugal force and the Coriolis force, that enable Newton's laws to describe motion in a non-inertial frame. An animation shows the motion of a ball rolling on a merry-go-round as seen both from the merry-go-round and from the ground.
This is part of a large web site, EinsteinLight, that explains relativity at a qualitative level from Galileo through the intersection with quantum mechanics.
%0 Electronic Source %A Wolfe, Joe %D November 29, 2007 %T Einstein Light: Inertial frames and Newtonian mechanics %V 2015 %N 1 September 2015 %8 November 29, 2007 %9 text/html %U http://www.phys.unsw.edu.au/einsteinlight/jw/module1_Inertial.htm
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