What’s does “co efficient of friction” mean and how is it different from Friction Force?
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The coefficient of friction is the material-specific number you multiply by to find the friction force.
For example, train wheels on steel rails have a coefficient of around 0.002, meaning that a 50 ton train has a friction force of ~980 Newton on horizontal rail, while a 500kg car (with its wheels replaced) would only have a friction force ~9.8N.
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