Rubber Band cars Stretching the limits

Rubber band cars are cars that are powered by tension created by rubber bands. The Rubber band cars are made from cardboard, rubber bands, wooden stakes and duct tape. To make the rubber band cars, we set the rubber band so that it could be secured to a part of the car, then wrapped the rubber band around the wooden stake as much as we can. The tension created by the rubber band propels the car forward when we release it. The tension in the rubber band is first potential energy, then it is converted into kinetic energy after it is release. Potential energy is a buildup of energy that had not yet been set in motion. Kinetic energy is the energy that is in a moving object,

Modification one- Our first car was a full square of cardboard as you can see. This car only went 9 feet, however we concluded from this that how sturdy the wheels are plays the biggest role in how far the car goes.
Modification two- For this model we cut the cardboard down to reduce weight and also put more tape on the wheels to secure the CDs. This added an extra 10 feet onto our beginning total, and at this moment our car went 19 feet.
Modification 3- This unique model we created was meant to make the car as light as possible without sacrificing stability. The sticks helped keep the shape of the car while allowing air to pass through for a light and sturdy model. We also added rubber bands around the wheels to give the CDs a better grip on the tiles. This allowed all of the force coming from the rubber band to be exerted without any slippage. The last modification we made was securing the wheels even further by adding extra tape around them. These changes allowed our car to go 32 feet.
Modification four- For our final car, we went back to the mostly cardboard structure of our car. However, we decided to add a skewer through the middle of the car and tie the band around that, which we cut in half to allow us to wrap more of it around the skewer. We also wrapped duct tape around the skewer and put the wheels over it, instead of what we did previously with taping around it. This greatly improved our distance as we achieved 51 feet with this model.
This was the model that went 51 feet, this was our farthest distance.
By using the video physics app we were able to calculate the acceleration and velocity of our car through using these formulas.
Created By
Boyuan Duan
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