What this calculator does
Calculate friction force from a coefficient of friction and normal force or mass.
How it works
The calculator evaluates friction force f = μN; on a level surface N = mg. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
5-
?normalSource=Normal force inputChoice · Required · Default: mass · Accepted values: mass, normal
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?coefficient=Coefficient of friction μNumber · Required · Default: 0.3
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?mass=Mass (kg)Number · Required · Default: 20
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?gravity=Gravity (m/s²)Number · Required · Default: 9.80665
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?normalForce=Normal force (N)Number · Required · Default: 196.133
Outputs
2-
frictionForceFriction force (N)Number · Primary output
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normalForceResultNormal force used (N)Number
Inputs and results
The inputs are Normal force input, Coefficient of friction μ, Mass (kg), Gravity (m/s²), Normal force (N). Results include Friction force (N), Normal force used (N).