In sixth grade science, students were able to create a roller coaster to showcase what they have learned about potential and kinetic energy, as well as gravity and inertia. Students were limited to using only materials they already had at home. The criteria for this project included a 1 meter height for the beginning of the coaster, at least two hills, at least two turns, a base of 1 meter x 1 meter or less, the end of the roller coaster had a way for the marble (train car) to stop and not fly off the track, and once the marble was dropped it must have made it through the track without being touched or flying off the track. The constraints they needed to consider before building included time, materials, and the amount of people in the group. There was a lot of problem-solving, communication, and laughter throughout this project. It's a favorite every year.