Coefficient of Static Fraction

Thread starter poonintoon
Start date Feb 6, 2014
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Coefficient Fraction Static

AI Thread Summary

The coefficient of static friction (μ_s) is often treated as a constant in tables, representing the ratio of the maximum static friction force (F_s) to the normal reaction force (R). While the friction force increases with applied force, μ_s specifically refers to the limiting friction at which motion begins. This means μ_s is effectively the coefficient of limiting friction, indicating the threshold before sliding occurs. Understanding this distinction clarifies why μ_s is presented as a constant despite variations in applied force. The concept is crucial for accurately interpreting friction in practical applications.

Feb 6, 2014

poonintoon

Please could somebody explain how the coefficient of static friction can be quoted as a constant in tables etc?
\mu_s = F_s/ R
In most cases the reaction force is constant but as I push the box harder the friction force increases.

Is \mu_s actually the coefficient of limiting friction? Or am I totally misunderstanding?

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Feb 6, 2014

A.T.

Science Advisor

poonintoon said:

Is \mu_s actually the coefficient of limiting friction?

Yes.

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