A mystifying physics demonstration from science teacher Bruce Yeany, in which he shows off a simple device known as a “string shooter.” It uses a motor drive to fling a loop of string into the air and keep it there thanks to their light weight and the inertia that keeps it moving forward.
While there’s no such thing as an actual perpetual motion machine (pesky physics!), this is still a cool demonstration how an off-balance mechanism can run for a relatively long period of time with minimal energy input.
This footage may be 8 years old, but it doesn’t make it any less impressive. Watch as then high school student Anna Gu demonstrates a bridge she made from layered and glued sheets of paper that was so strong that the hook that held the weights failed before it did. Design here.
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