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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?