How can I run a small vehicle?

Question

I'm building a small vehicle. Sort of like a go-cart.

So, i didn't want to just go out and buy a motor, I was wondering how I could power it in different, creative ways.

Answer 1

Here's an idea. A rubberband motor. You can build it yourself or buy different kits.

http://www.pbs.org/saf/1103/teaching/tea...

Answer 2

Invent a milk motor.