Rubber Band Car

Rubber band cars are made from a flat cardboard body, a skewer, tape, CD's for wheels, and a rubber band. We used the cardboard to level out and be the base of a car to keep every object in tact. We used 3 skewers which are used for different purposes and parts in the car. One skewer was used to stick through the middle of the cardboard body to use as a place to wind our rubber band. The other skewers were used at the bottom of the body to hold the rubber band and to help balance the car. The CD's were the wheels that gave the car a way to roll that needs the help of the body to move. The rubber band was used to wind up the wheels using a skewer that gave the car the energy needed to move.

Potential energy is the position of an object that gives it an advantage to perform an action. The potential energy involved in the car is shown through the rubber band that wraps around the skewer. Kinetic energy is the act of an object fulfilling its potential energy by the object performing the action. Once the band is released the act of kinetic energy is performed as the skewer spins the wheels to allow the car to move.

Improvements from Mistakes

At the beginning, our wheels struggled to stay still and it would often wobble causing our car to crash on the side. We improved our wheels by having a lot of tape spun around to make our wheels stay in place. The wheel support modification made our car go 41 tiles.
We were first using our rubber band as is, but weren't using it to its maximum potential. We cut it so it could spin around the skewer more, and create more kinetic energy due to the potential energy of the longer rubber band. This allowed our car to go 41 tiles.
In our first car, we tried to go for something cool, and it did not work out for our car because every time we wound it up, it would bend and effect the car because it would also drag on the ground and cause the car to move to the side due to the pointy shape we decided to use for the car. The second car, we used most of the cardboard and this ended up adding on weight, and it did not go very far. Our third car, we took most of the card board off, and this allowed us to have a light upper for the car to go further. The furthest this modification made our car go was 41 tiles.
Our fourth modification was the skewer at the end because it helps our car balance out while helping our rubber band get to it's maximum potential for a good wind up. It helps our rubber band get more tension, and more potential power for our car.
41 Tiles, 1 Tile, 7 Tiles

We used the Video Physics App to analyze the velocity and acceleration by plotting points on where the car was during the time, it then calculates the velocity and acceleration. Velocity = Distance/Time Acceleration = m/s2

The angle the video was taken at this angle because it is used to show how the velocity and acceleration is active in the car, while using the meter stick to find the velocity and the acceleration.

The graph of velocity shows the slope of the line on a velocity-time graph. This also helps us find the acceleration because if the acceleration is zero, the slope is zero, and if the acceleration is positive, the slope is positive.

To find the acceleration of our car, we needed to put it into slope form which is y1-y2/ x1-x2, so we picked out 2 points from the bottom graph and plugged it into our formula, and we ended up getting 1.2m/s2

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