When teaching forces and motion this activity visualizes to the students the effect forces have on the motion of a roller coaster. It stimulates students in a way that makes learning about  forces involved in riding a roller coaster fun and excitin. Giving students choices on increasing or decreasing these forces gives them a real understanding on the cause and effect of their choices and its effect on the roller coaster and its occupants.

Welcome to the death defying Funderstanding Roller Coaster!
This simulator is designed for people who want to design their own thrilling coaster and educators who want to use a cool activity to simulate the application of physics by using an exciting interactive tool and access to a wonderful reference source.
It is your mission to become a roller coaster designer so that you can achieve maximum thrills and chills without crashing or flying off the track (unless that’s how you like your coaster to work!).

If you accept this mission you must decide on a number of factors. You are responsible for setting the controls for the height of hill #1, hill #2, the size of the loop, the initial speed of the coaster, its mass, the gravity at work and the amount of friction on the track.

- See more at: http://www.funderstanding.com/educators/coaster/#sthash.Raf1pPEu.dpuf