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Feb28-12, 04:58 PM
Do some experiments: Take a toy car roll it down a hill. Take a can of beans and roll it down a hill. which one rolls straighter. Add some weight to the car...
Keep in mind you want to keep friction to a minimum. Is the road surface bumpy then maybe wheels will work better (less contact on the road than a cylinder).
Checkout soapbox derby designs. Oh and lest I forget to mention: do some experiments.
The plane is just a regular piece of plywood, fairly smooth! Thank you!