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Friction is useful when you are trying to stop a car, but not useful in the pistons of a car's engine (It makes them less efficient).

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βˆ™ 15y ago
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βˆ™ 8y ago

If you think about it, anywhere lubricant is used to prevent the wear or heating of parts. Engines, Axels, hubs and shafts...

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Q: When Is Friction Useful and When Is Friction Not Useful?
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