Flight Safety
I am going through the previously mentioned Physics course and it is very easy reading.
You will find centripetal force is explained by applying your vector arithmetic to a circumference and looking at smaller and smaller time intervals between adjacent velocity vectors.
<a href="http://www.mcasco.com/p1mot2d.html" target="_blank">Motion in 2 Dimensions</a>
Your concern about 'inertial reference frame' is defined in <a href="http://www.mcasco.com/p1ns.html" target="_blank"> The Nature of Space</a>
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Just wait until the topic changes to the Coriolis EFFECT. Or would that be a hijacking of this thread? <img src="smile.gif" border="0">
[ 31 December 2001: Message edited by: Dave Jackson ]</p>