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arons and dry ice



I read in arons (sorry don't have the specific reference) 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? I am not sure where I will obtain these things but the idea is a
great one...much better than 1 dimensional pasco carts or even an air table
(since the pucks have such low mass). Are there similar but easier things
folks have tried?

thanks for the help

Justin

This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.