Friction Force

Dry friction resists sliding in proportion to how hard the surfaces are pressed together — Coulomb’s friction model.

The friction force is F = μ·N. where μ is the friction coefficient and N the normal force.

Inputs

mu := 0.4=0.4

N := 500 N=500 N

Multiply the coefficient by the normal force.

F := mu·N=200 N

Results

This is the maximum static friction before sliding starts; once moving, the kinetic coefficient (slightly lower) applies. Friction is independent of contact area.

Assumptions & limitations

Coulomb (dry) friction.
Rigid surfaces.
Independent of contact area and speed.

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