Category:Coefficients of Friction
This category contains results about Coefficients of Friction.
Definitions specific to this category can be found in Definitions/Coefficients of Friction.
Let $B$ be a body at rest on a plane surface $S$ on which friction acts.
Let $N$ be the normal reaction of $S$ on $B$.
Let a force be applied to $B$ parallel to $S$.
Coefficient of Static Friction
Let $F$ be the magnitude of that force in the limiting case when $B$ is just about to move.
Then the coefficient of static friction is defined and denoted:
- $\mu_s = \dfrac F N$
Coefficient of Kinetic Friction
Let $F$ be the magnitude of that force needed to keep $B$ moving at a constant velocity.
Then the coefficient of kinetic friction is defined and denoted:
- $\mu_k = \dfrac F N$
These coefficients of friction depend upon the materials out of which $B$ and $S$ are made.
It is usual for $\mu_s$ to be greater than $\mu_k$.
Pages in category "Coefficients of Friction"
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