I think this kid has done an incredible job. What a neat project! Physics? ;)
There are many ways to learn.
Below, this is found under the video:
This is the biggest K'nex coaster I have ever built! It starts in my room, goes down to our basement and back up using five chain lifts. I even had to order an extra 500 chain links to finish it and had to screw/drill/nail parts into the wall. Thanks so much to my patient parents for letting me build this amazing project!