# Physics Study Guide/Frictional Coefficients

## Approximate Coefficients of Friction

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**Material**

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**Kinetic**

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**Static**

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Rubber on concrete (dry)

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0.68

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0.90

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Rubber on concrete (wet)

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0.58

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Rubber on asphalt (dry)

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0.72

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0.68

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Rubber on asphalt (wet)

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0.53

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-.\--

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Rubber on ice

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0.15

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0.15

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Waxed ski on snow

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0.05

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0.14

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Wood on wood

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0.30

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0.42

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Steel on steel

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0.57

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0.74

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Copper on steel

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0.36

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0.53

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Teflon on teflon

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0.04

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-.\--

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