The Spool Paradox

Summary by Krater

An exploration of the physics behind spools of thread and cords, explaining why pulling a cord can make the spool roll towards you due to mechanical advantage and pivot point mechanics.

From the video

Answers: Why does a spool roll towards you when you pull the string?

• spool physics
• mechanical advantage
• pivot points
• friction in physics
• rope pulling mechanics

What it concludes

• Pulling on a rope wrapped around a spool causes the spool to roll towards you and the cord to get shorter when pulled from the bottom, creating a mechanical advantage.
• When the pull angle passes through the pivot point, there is no turning force and the spool simply slides.
• Completely filling the spool creates a singularity in the mechanical advantage equation, resulting in infinite mechanical advantage in theory.
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