How do power car tires.1. prepare water bottles, plastic bottle 1. Rubber 3-4 lines 1 thick cardboard sheet. Solid wood 1 plug. The color of paper, 1 sheet Glue, scissors, Cutter2. cut 2 cardboard circles circles and then color wrapped around the paper to reduce friction.3. wood is plugged into the center of the wheel, the two wheels and glue to give tight up.4. using the cutter drilling water bottles along the length, width and length sufficient for approx.5. hundreds of rubber bands together and stuck in the middle of the bundle of wood and wheels fastened the other end leads to bundle next to the mouth of a bottle of water and close the lid.6. rotate the rear wheel to provide power to the wheels, release occurs, rubber bands. The car will be able to rush forward.
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