## Rubber band carBy Nick toland and Christian gildea

In our science class we were taught about types of energy and forces. Before we take you on a journey through our progression in our car ideas and design, we need to tell you about the different types of this energy.

Definition of kinectic energy- "In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes" to me this means the energy it has while the object is in motion which is built by its velocity and other factors.

Definition of potential energy- "the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors" to me this is the build up or gaining energy. It is the energy within the object

Kinectic energy is energy in motion we're potential energy is getting energy
In this the potential energy is when it is because it has potential to relish the energy, when it does it is kinectic energy

We started with a basic prototype moving a couple of tiles. We noticed that we needed to find a way for the car to have more grip and more time spinning.We tried bigger and smaller bands to see if we can roll further. We then changed the body into a cross. The weight part definitely worked but it still wasn't rolling too far

We tried a new way to put on the wheels. We rolled up tape enough so we can slid the wheel onto the tape roll enough so it is snug and tight. This keeps it very balanced.

We then needed to add grip so we put thick rubber bands around the CD wheels giving it enough grip to roll further.

Adding a screwer in the back to stretch out the band more and try to make it go further because it will go faster

In our final design we cut the rubber band making it twice as long. We put a screwer out the back of the cardboard base. We taped the rubber band to the stick and then pulled and wrapped around the front screwer. This way when the rubber band is down turning the front screwer it will still roll after the band is down turning it.

To calculate different acceleration speeds and velocity, we used video physics. Video physics allows us to see the acceleration and velocity of our car. The formula for acceleration is below.

This chart above is the graphs created by video physics showing us our speed over time and velocity over time. This is cool to see how atsome points are car goes fast but then slows down.

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