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Why a Tennis Racket Led Russians to Believe the Earth Was Going to Flip

The basic physics behind the Intermediate axis theorem.

GIF from, image from

Laws of Angular Motion

Moments of Inertia

Different moment of inertia calculations for different shapes. Image from

An Intuitive Description of the Theorem, and Rotoational Forces

Image from David Muller’s Youtube Channel, Veritasium
Ride at Sunway Lagoon

The Math

Euler’s equations

How was this discovered?

The End of the World




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