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Coefficient of Friction (μ) Calculator

Compute μ, friction force, normal force, or critical incline angle. Units: N for forces, degrees for angles.

Material pair (reference presets)

Use static or kinetic coefficient?

μ (coefficient) — override preset

Compute mode

Friction force (F_f) [N]

Normal force (N) [N]

Incline angle θ [deg]

Notes:

Preset values are typical approximate ranges — real μ depends on surface finish, contamination, lubrication, temperature, and normal pressure.
Static μ (μₛ) is used to determine whether motion starts; kinetic μ (μₖ) applies once sliding occurs.
For block on incline, motion begins when tan(θ) > μₛ (ignore rolling, adhesion effects).

Coefficient of Friction (μ) Calculator