For the second design, instead of a balloon used as a force, rubber bands will be used. The main structure of the car will be made out of Styrofoam This is because Styrofoam is light and that will be an advantage. For the wheels and axles, bottle caps and nails will be used. Two bottle caps will be attached to each side of one long nail.One of these sets for the front, and one for the back. They will be glued on to the bottom of the Styrofoam base. Between the two nails, a cut rubber band (so that it is single) will be attached. The side attached to the back will be winded over and over. When this is released, the car should move forward.
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