How Do You Derive the Static Coefficient of Friction Between Metal and Wood?

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livcraig
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hey guys i am really stuck i need to find the derivation for the coefficient of friction between metal and wood, there are no numerical values to calculate i just need to figure out out the heck you derivate this!

mu = (1/cos theta)*[(W/mg)- sin theta]

It is a system where the wooden block is on an inclined plane and Tension is provided by weight in pan which pulls using its own mg through a pulley system W = Mg of weights in the pan.
 
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