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Phys-L <http://lists.nau.edu/archives/phys-l.html>,
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AP-Physics <http://lyris.ets.org/cgi-bin/lyris.pl?enter=ap-physics>.
In his Phys-L post of 8 Oct 2002 19:33:55-0400 titled "Arons and Dry Ice,"
Justin Park wrote (slightly edited):
"I read in Arons [sorry don't have the specific reference. . .(it's
Arons 1990). . .] earlier today the section on introducing Newton's
laws and specifically the concept of inertia and the effects of
forces on a body's motion. He recommends a 50-lb piece of dry ice on
a sheet of glass. (!) Has anyone done this? How big is the sheet of
glass? How big is 50 lbs of dry ice?"
Has anyone done this? YES! The Arons
50-lb-dry-ice-floating-on-glass-method of getting Newton's First Law