A gigantic gyroscope wheel
Very visceral experience of a gyroscope AND of a flywheel’s stored energy.
Made of a bicycle tire or larger.
Anywhere from $25 to hundreds, depending upon materials used.
people must not be capable of getting near the wheel.
My mom had us suspend a wheel from a spring scale once and spin it to see if centrifugal force caused a weight loss (thus a flying saucer idea dispelled) when we were 14 or so.