Testing If You Can Blow Your Own Sail

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

Mark Rober tests six physics and engineering puzzles using simple demonstrations to explain the underlying science, including the Coriolis effect and Newton's laws.

From the video

Answers: Are the tourist sink demo, the rope circumference paradox, and other popular physics puzzles real or scams?

Coriolis effect
Ellipse optical properties
Newton's laws of motion
Atmospheric pressure
Fluid dynamics
Circumference rope paradox

What it concludes

The tourist sink drain demonstration at the equator is a scam and does not rely on the Coriolis effect.
Adding 6.28 feet of extra rope is enough to lift a rope a foot off the ground around the entire Earth or a basketball.
HoverGlide backpacks reduce impact forces by 80 to 90 percent on flat terrain but add weight and are not worth it on rugged hiking terrain.
Drain and toilet spin direction is determined by the nozzle angle rather than the Coriolis effect.

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