Coefficient of friction calculation

AI Thread Summary
The coefficient of friction is typically not calculated from first principles but is instead measured as an engineering approximation. It represents the ratio of the friction force to the normal force acting on an object. To determine it, one must apply a normal force, such as a weight, and measure the maximum friction force before movement occurs. This measurement allows for the calculation of the coefficient of friction by dividing the friction force by the normal force. Understanding this concept is essential for exam preparation in physics.
Jothi
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Need to know about coefficient of friction for my exam.

http://easycalculation.com/physics/classical-physics/friction-table.php
This site shows coefficient of friction of various materials to materials. But no calculations are given.

Can somebody help me on how to calculate the coefficient of friction ?
 
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The coefficient of [static or dynamic] friction is not ordinarily something that one calculates from first principles. It does not arise from some simple underlying physics. It should be regarded instead as an engineering approximation that is observed to hold in a many circumstances. Instead of calculating it, you measure it.
 
The coefficient of friction is the ratio of the friction force to the normal force. To measure it you apply a normal force (eg a weight) and measure the friction force (eg max force that can be applied before the object moves). Work out the ratio.
 

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