The links above is to my roller coaster. The purposes of this roller coaster was to teach about gravity. So what I leaned about gravity was that gravity pulls everything down. So when you are going up hill it is going to be harder than going down hill. Also if you marble stops in any part of the ride it will not go anywhere. I also learned that the more acceleration you use the faster it goes and the longer it goes. That’s why if you push something harder it goes longer. That’s what I learned about gravity from this lesson.