PHYSICAL QUANTITY

Friction coefficient: formulas and units of measurement

Friction coefficient: symbol μ, unit dimensionless. Formulas and explanations for Mechanics.

\mu

\text{dimensionless}

dimensionless quantity

KEY CONNECTIONS

Formulas

μ = \frac{F _{fr}}{N}

μ = Ftr / N

F_{fr} = μ N

Ftr = μN

F_{fr} = μ m g

Ftr = μmg

F_{fr} = μ m g cos α

Ftr = μmg cos α

NOTATION

$\mu$: Friction coefficient is a characteristic of the resistance to movement of contacting surfaces.
$F_{\text{fr}}$: Friction force is a force that prevents the relative movement of surfaces.
$N$: The support reaction force (normal pressure force) is the force with which the support acts on the body perpendicular to the surface.
$m$: Mass is a scalar physical quantity that is a measure of the inertia of a body.
$g$: Gravity acceleration is the acceleration of a body under the influence of gravity without taking into account the resistance of the medium.
$\alpha$: Angle is a quantity characterizing the mutual rotation of directions.

THEORY

PRACTICE