For our fourth stem project we had to make was a car that would go on its own and stop at a distance of 5 meters. We made 3 different cars before we got our final result. Our first car was a mouse trap car that ended up breaking before we could really use is. The next car we made was a rubber band car, that car didn't go so well. It would only travel in circles. We finally made our final car,balloon powered, which worked perfectly. we where able to get it to go the full 5 meters no problem.
For our tires we used large CD's because the larger the wheel the easier it is for the car to travel.
looking back at my project i think all and all it went very well. we all put fourth a ton of work and worked well together. We found good ways to get everyone participating. one thing i would have change is i wish we really drew out what we where gonna do before we started to build. i wish we didn't put the penny's all over the bottom though, because it just didn't work too well. i can say that before this i knew nothing about cars and such but after this i learned a lot about different energies.
These are all the graphs we put into our presentation.
For our calculations we had to find kinetic energy, potential energy, thermal energy, and power.