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Physics

Rotational Motion

Quick fact

When a figure skater pulls their arms in during a spin, their rotational speed increases dramatically due to conservation of angular momentum—a principle used by neutron stars to spin at hundreds of times per second.

Why this is interesting

Spin a coin on a table. Why does it stay upright for a while and then wobble and fall? The answer lies in the physics of rotational motion, a world of angular velocity and torque that governs everything from a spinning top to the Earth's rotation.