# Real coefficients of restitution/friction

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Can anyone direct me to any examples of coefficients of restitution and friction, specifically rock-on-rock, rock-on-metal and metal-on-metal?

(haha, that sounds like music genres..)

The only articles I've been able to find explain the process of using them and calculating them, but no actual numbers.

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The Coulomb model of friction is only valid for smooth surfaces, so by "rock" I hope you mean "marble floor". Anyhoo, googling "coefficients of friction" turns up plenty of tables. If you have a coefficient for two surfaces individually, there's a variety of methods for getting a coefficient between them; the geometric mean is probably the most accurate, but I find using the minimum is better behaved.

Restitution is a lot trickier... it's really more a product of the object than the material, and is also affected by relative velocity. Pick something that looks good and plays good.

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