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I know that you posted this under Elementary Science, but I found a high school article that might give you some great ideas that could be adaptable to elementary grades. It is called "Rev You Engines" and can be found at http://learningcenter.nsta.org/product_detail.aspx?id=10.2505/4/tst09_076_02_35
I also wrote a review about it. Here is the review...
This article on rubber band cars takes the activity into the real world of high school students by having them design a car, holding a drag race, measuring distance, checking piston pressure, testing the color of headlights, measuring change in a soda can radiator, and even passing an inspection!! This is definitely an all-inclusive article!!
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