## Our rubber band carBY MIKA BAUK AND NEIL MURPHY

The car is made up of cardboard as the base, a rubber band to make the car move, a scewer to connect the wheels together, and cd discs to act as the wheels of the car.

How elastic potential energy is turned into kinetic energy by the rubber band is because the rubber band is tied around the scewer, and when let go, it snaps back and gives the scewer, connected to the wheels, energy to move. The potential energy is the energy the car will get from the rubber band being pulled back and then snapping to its original form, and kinetic energy is the energy is actually gets while in motion

This is an example of what elastic potential energy is. When the car is pulled back with the rubber band, it has potential energy built up based on how far it is pulled back, and when let go, the car releases the energy and moves foward.

Here is a video on how the car moves based of the rubber band snapping

We have made two modifications here. One of them is the rubber band on the wheel we did this because it has more traction on the ground and would not slide on the ground. The second modification we made was to role the tape on the skewer then slide the disk on this helps because it helped keep the disk straight and connected to the axes.

We add this skewer on the end as a tail. This helps the car because it lifts the body of the car and made it flatten and had less air resistance on the car. It also has less friction on the ground then the card board and doesn't slow down as much.

When we first built our car one of our problems was when we spun up the rubber band the cardboard couldn't take the the pull on it and it would bend and break the car so we cut a skewer in half and taped it onto our car so it would bend any more and would help keep the car in better shape and would last longer and would have less friction on the axis.

With all of the modifications, the furthest the car went was 46 ft. Here is the video of it going 46ft.

We used the video physics app to analyze the velocity and acceleration of the car. We first recorded our car going, and we put dots where the center of the wheel is during different parts of the video. We also had a meter stick in the background to show how far it went. The app collected the information and make a graph out of it based on how fast it went per second and it's velocity.

The second graph shows the meters the car covered per second and what time the car reached a certain amount of meters. The first graph shows the velocity of the car and how high the velocity got for the car in the amount of time.

And here is the video we used for the graph

The acceleration of the car was 1/4 meters per second. We found this by subtracting 4.5 by 2.5 for the time, and the meters it went at that exact time from the graph below.

The velocity of the car was 3.2/2.5. We did the same method for the velocity as the acceleration, and the numbers we found was from the graph below

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