# Coefficient of Static Fraction

1. 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?

2. Feb 6, 2014

Yes.