Yeast Mobile

Yeast and Sugar

We decided on our sugar to yeast ratio by conducting different ratio tests. First, we took a large tub and filled it with about halfway full. Then we measured out different amounts of both yeast and sugar. The amounts we tested were: .3g, .5g, .8g, and 1.0g of yeast with .5g, .8g, and 1.0g of sugar. We found out that 1.0g yeast with 1.0g sugar worked the best to build up the gas that would launch the car. 

 

Building 

When we were building the mobile, the wheels did not have good traction, so we put rubber bands around them. The pegs that held the black rods together kept slipping, so we had to use little yellow rubber stoppers so that they wouldn’t slide out. We had to find the right angle to set the syringe on the car because the launching black rod would hit it when we would test it. One of the last things we put on the yeast mobile was our string. We had to cut the string a couple of different times to get the right length, so there would be more force to keep the car going. 

 

Testing

During the testing of the mobile, it did not initially move because the pressure was pushing the syringe out instead of the gas pushing the lever. This was because the nail was not pushed in super securely to prevent the syringe from moving. To fix this, we just pushed the nail in further and this caused the lever to move and then our car moved.