Coefficient of friction calculation

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SUMMARY

The coefficient of friction is an engineering approximation rather than a value calculated from first principles. It is defined as the ratio of the friction force to the normal force. To determine this coefficient, one must measure the friction force (the maximum force applied before an object moves) while applying a normal force, such as a weight. Resources like the EasyCalculation website provide tables of coefficients for various material pairs but do not offer calculation methods.

PREREQUISITES
  • Understanding of basic physics concepts, particularly forces.
  • Familiarity with measuring tools for force, such as spring scales.
  • Knowledge of static and dynamic friction definitions.
  • Basic mathematical skills for calculating ratios.
NEXT STEPS
  • Research methods for measuring friction force using a spring scale.
  • Explore the differences between static and dynamic friction coefficients.
  • Learn about the factors affecting the coefficient of friction, such as surface texture and material composition.
  • Investigate applications of the coefficient of friction in engineering and design.
USEFUL FOR

This discussion is beneficial for physics students, engineering students, and professionals involved in material science or mechanical engineering who need to understand friction in practical applications.

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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