Have you ever wondered how inline skate wheels and electric motors spin so smoothly and quietly? The answer lies in a small but essential component: the bearing.

Bearings are the unsung heroes behind countless machines. They reduce friction, allow precise motion, and extend component life by keeping moving parts clean and separated. Without them, everyday devices would break down more often.

In this guide, we’ll explain the physics of bearings, explore common types—including ball, roller, and needle bearings—discuss their typical applications, and highlight surprising uses in fields from aerospace to biomedical devices.

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