balls and tracks

this week my partner, jamiah, and I worked on building a rollercoaster, that will let a marble stay on the track as long as possible. We used foam pipe, tape, marbles, and popsicle sticks. the hardest part about making the rollercoaster was trying to keep it stable. my partner and I learned that the stiller or more stable it is then the greater the height. Using the bigger marble wasnt good because it made the rollercoaster unsteady.