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Jul 09 2025SCIENCE

How Wheels Can Teach Us About Friction

Friction is a force that we feel every day. It is the reason why things slow down or stop when they slide. Scientists have known for a long time that friction between two dry surfaces does not change with speed. But what if there are many points of contact, and each one moves at a different speed? This is what a recent study explored. Researchers built a rotating ca...

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