Rubber Band Car Project Deven KArr, Nick McDonough, Drew Ridley

Making a Basic Car

Materials

- Two CD discs -

- Piece of Cardboard-

- Rubber band -

- Duct tape -

- Wooden stick -

  • Cut a square in the front of your cardboard like above, (remember to keep the corrugated side with the opening facing away from the open cut.)
  • Stick your wooden stick through the corrugation in the side, making sure it goes through the opening in the front of your car. Also add a roll of duct tape with a tab for your rubber band to wrap around on. (See below)
  • Time for the wheels, add a roll of du tape to one side of your axel that measures about the same size of the opening in the middle of the CD. Then put on your CD. (see below)
  • Now place your rubber band below the opening in the front of your car and secure with duct tape. (See below)
  • Wrap the rubber band around the duct tape tab you made earlier on the axel.
  • You have finished the basic car. Wind the axel backwards and let it fly!

Potential and Kinetic Energy

The elastic rubber band potential energy (the energy stored in a body when not moving) is demonstrated alongside kinetic energy (energy possessed by a body in motion) when the rubber band is winded up which gains potential energy and shows kinetic energy when it is released, spinning the axel.

Modifications

Roll of TaPe

This modification majorly improved our car because it made the connection between the axel and the wheel a lot more stable. Because we rolled up the duct tape slightly larger than the hole in the wheel, it allowed the wheel to not move on its own.

Car Distance with Mod: 7ft

Modification of the BodY

This modification helped the car move further very much. The modification itself is the cutting off of the back of the car to reduce drag. This meant that the car would not be slown down as much by the back of the car.

Car Distance with Mod: 11ft

Rubber bands on Wheels

Adding rubber bands to the wheels greatly increased the traction on our wheels. Having slippery wheels on a slippery floor can make the car spin out of control, adding the rubber bands keeps the car on a straight path over the slippery floor.

Car Distance with Mod: 13ft

Wooden poll on back

The wooden pole on the back of our car is another solution to solving the problem of drag on the car. Adding this narrow pole on the back decreases the size of the car being dragged on the ground.

Car Distance with Mod: 10ft

Velocity and Acceleration

We used the Video Physics app to analyze acceleration and velocity of our car. To do this we took the video in a specific form. We tracks our car from the app and set the measurements it needed to use. After many tries we were able to get solid results. (Velocity = Distance/Time, Acceleration= Change in Velocity/ Change in Time)

The angle in the video needed to be shot to show the whole length the car travelled with a meter stick to tell the app what measurements to calculate. We added the points on the app to make the graph below.

The graph above shows the dots going up and down, when they are up the cars speed is faster than the dots that are lower which shows the car going slower.

Acceleration

To calculate the acceleration which was 2.25 meters a second, I first found the change in velocity between two points and then calculated the change in time between two points. Finally I divided them together and got my answer.

Thanks for reading!

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