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I'd vote for the carts with metal tracks. We use the Pasco product. For
conservation of momentum, carefull students will get a %Error of less than
5%. I think the vernier tracks can be expanded to be used as an optics
bench. However, I think Pasco sells some less expensive carts (as well as
some more expensive carts).
With Air tracks you would need an additional power source and ear-plugs.
Paul Lulai
Physics Teacher & Online Learning Coordinator
St. Anthony Village Senior High
Saint Anthony Village, MN
55418
(w) 612-706-1144
(fax) 612-706-1020
plulai@stanthony.k12.mn.us