Coefficient of Static Fraction

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.
poonintoon
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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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poonintoon said:
Is \mu_s actually the coefficient of limiting friction?
Yes.
 
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