Backyard Roller Coaster STEM Course Part 1

I made this series of videos to practice teaching my BYRC STEM course. I'm sure there are errors. I didn't practice much.
The intent is to teach some physics, math and engineering where students get to build and ride their own roller coaster.

[@d1ddle]

no way! I love engineering and already want to do this!

[@user-mq9fn1su3q]

cool, it is so beautiful

[@winnerthai5892]

that cool