I'm sure many people have heard of these, but for the very small percentage of you that haven't, A mousetrap car is a small car that only uses a mousetrap's spring for power. My school recently decided to do a competition, and I just submitted mine for the competetion a couple of days ago. The competition is on distance traveled from the starting line. I saw most of the other entries and none of them had the idea to add gears to the car like mine to allow instead of only about 10 CM of string wrapped around an axle, it has the effect of nearly 100 cm of string wrapped around the same axle.
I will post pics of the car after the competition as i do not have it in my posession ATM, but I will after 4/19.
If anyone else has experience with these, go ahead and put it here.