The Turntable Paradox

Summary by Krater

Steve Mould explores why a ball spinning on a turntable orbits twice for every seven turns of the turntable, explaining the phenomenon through the conservation of angular momentum and moment of inertia.

From the video

Answers: Why does a ball orbit twice for every seven turns of a turntable?

• turntables
• orbital period of spinning balls
• moment of inertia
• Newton's laws of motion
• Coriolis force
• gyroscopes

What it concludes

• A solid ball on a spinning turntable will complete two orbits for every seven turns of the turntable.
• A hollow ball on a spinning turntable will complete five orbits for every two turns of the turntable.
• The orbital period of a ball on a turntable is determined by the turntable's period multiplied by the ratio of the ball's mass and radius squared to its moment of inertia plus one.