What happens when smaller wheels are used in front and bigger ones at the back and vice versa? Does it become faster or slower?.Do certain types of wheels offer less friction and speed up the car while others don’t?.Plans to Try Outĭecide on the best car design by checking the following. It would be a good idea to draw a blueprint of the desired plan on paper before starting off if children are doing it in the school lab or performing at a science fair. Listed below are a range of design ideas that you can choose from. Wooden dowels threaded through straws work well as the axle. Plastic bottle caps, toy wheels like those of K’NEX, film canister caps can also serve as the wheels. Instead of cardboard, the cars can use a variety of lightweight materials for the chassis such as Lego, balsa wood, light plastic container, cereal box or foam board. It works on the principle of conservation of energy that energy can neither be created nor destroyed, or the total energy in an isolated system remains constant. Hence, the more the winds of the rubber band, the faster and longer your drive. The rubber band unwinds to regain its former configuration spinning the axle and propelling the car forward in the process. On twisting the rubber band around the axle, you are storing potential energy in it that gets transformed into kinetic energy when you let it go. Toothpicks, straws and bottle caps constitute this unique design of rubber band race car. Rubber Band Car Picture 7 How to Build a Rubber Band Car: Video
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