Friction Calculator
Calculate static and kinetic friction forces. Find friction coefficients and determine if objects will slide.
Free Body Diagram
Weight (W)Normal (N)Applied (F)Friction (f)
Friction Force
49.05 N
Max Static Friction
98.1 N
Normal Force

Common Friction Coefficients

Materialsμsμk
Rubber on dry concrete10.8
Rubber on wet concrete0.70.5
Steel on steel (dry)0.740.57
Steel on steel (lubricated)0.160.06
Wood on wood0.50.3
Ice on ice0.10.03
Teflon on steel0.040.04
Aluminum on steel0.610.47

Formulas

f = μN (Friction = coefficient × Normal force)
N = mg (for horizontal surfaces)
fs ≤ μsN (static friction has max value)
fk = μkN (kinetic friction is constant)

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