View Full Version : Newtons Laws?
AfRoMaNn
Oct17-10, 06:15 PM
What exactly happens when a tablecloth is pulled out from underneath a table setting, and everything on the table stays put? Newtons laws certainly applies to it but maybe inertia as well?
Dr Lots-o'watts
Oct17-10, 08:27 PM
Newton's first law and inertia are practically the same. Perhaps worded differently sometimes, but it all refers to the same "phenomena".
You also need a low coefficient of friction between glassware and table cloth, high speed, and preferably low centers of mass for each piece.
vlado_skopsko
Oct18-10, 04:57 AM
Yes. And the coefficient of friction (The force of friction) does not depend on speed (it is an empirical equation, so it may depend a little), so faster you pull the tablecloth, less time force acts on the glasses and stuff.
Yes, my previous physics teacher performed this as a demonstration in class once, and looking back at it now it makes much more sense
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