Quote:
Originally posted by camtunkpa
hehe 222's solution....use gum rubber! 
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That was actually one of the ealy ideas tossed around.. however, it was put down due to friction.
I have thought about testing the pb jar lid.. might me an interesting alternative.
[edit]Sorry, this might of helped. I didn't realize this was part of it, till Bob brought it to my attention:
Score is calculated by dividing 25 by the mass of the car. Then multiplying the result by the (length the car traveled divided by the maximum length of the car)^2.