The Kid Should See This

Mark Rober investigates seven physics and engineering puzzles

Watch more with these video collections:

Can sailboats be powered by fans instead of wind? What does the moon look like from different points of our spherical planet? What can a laser pointer and mirrors reveal about ellipses? Does water swirl one direction just north of the equator and the other when moved just a few feet south?

Mark Rober goes myth-busting and evidence-validating as he investigates seven “physics and engineering puzzles using simple demonstrations as we go.”

“Because our goal by the end of this video is for you not just to know the right answers, but more importantly for you to understand why they’re the right answers.”

seven physics puzzles
The topics: Moon orientation in different hemispheres, ellipse geometry and sound reflection in National Statuary Hall, inertia and air pressure with a balloon, sailboat (and skateboard) propulsion, the Rope Around the Earth math puzzle, a “floating” backpack invention, and testing a Coriolis effect tourist demo near the equator.

Is this the equator?
Spoiler: Coriolis force is real; its effect on tiny bodies of water like sinks and toilets is essentially nonexistent. Watch to learn why.

Promotional messages for Rober’s engineering-themed subscription boxes are from around 7m50s to 8m42s and 15m50s to the video’s end.

Mark Rober with a large red balloon
Then watch these videos next:
β€’Β Why don’t perpetual motion machines ever work?
β€’Β How a mathematician dissects an astonishing coincidence
β€’Β Why do people fall for misinformation?
β€’Β Debunking the β€œI will never need to use this…” myth
β€’Β Five unique at-home science experiments with Physics Girl
β€’Β Ten easy science experiments for kids at home
β€’ What on Earth is spin?
β€’ The story of Eratosthenes and Earth’s circumference, as told by Carl Sagan


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