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Last summer, we had a Science Saturday where we experimented with race cars out we made out of LEGOs.
Using our Pepsi Refresh Grant, here was what we purchased to make our LEGO Race Cars for around 20-25 cars:
3 sets of LEGO Education Wheel Sets
1 set of LEGO Bricks & More Deluxe Brick Box
4 sets of LEGO Bricks & More Builders of Tomorrow Set
There were no instructions, we just let the kids build whatever kind of car they wanted (first come first serve on the size of wheels though, which affected the drive too). If they had time, they were encouraged to test and redesign their cars to see if they could make them go faster and further down the ramp/landing strip.
We used particle boards as race car ramps and placed them at different heights. Quickly, the kids learned the biggest ramp yielded the most desirable results. The link above has a good rundown on how the experiment went with our friends. It was one of our most popular Science Saturday event and will most likely be repeated in 2014.