Mechanics
Friction Force
Friction opposes relative motion between surfaces.
Variables
fN
Friction force
Force opposing motion
μunitless
Coefficient of friction
Dimensionless constant
NN
Normal force
Perpendicular contact force
Derivation
Empirical relationship. Static: f ≤ μₛN; Kinetic: f = μₖN.
Your notes
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Common questions
What is the Friction Force formula?
Friction Force is written f = μN. Friction opposes relative motion between surfaces. It belongs to Mechanics, under Dynamics.
What are the units in f = μN?
In SI units, f is friction force, measured in kg·m/s²; μ is coefficient of friction (dimensionless); N is normal force, measured in kg·m/s².
How is the Friction Force formula derived?
Empirical relationship. Static: f ≤ μₛN; Kinetic: f = μₖN. The result is f = μN.