What is the friction formula?

F = μN, where F is friction force, μ (mu) is the coefficient of friction, and N is the normal force (often equal to weight on a flat surface).

Use consistent units: if N is in newtons (N), F is in newtons. If N is in pounds, F is in pounds.

Online Friction Calculator

Compute friction force F = μN from coefficient of friction μ and normal force N. Simple physics calculator.

Coefficient of friction μ

Normal force N

What is the friction formula?: F = μN, where F is friction force, μ (mu) is the coefficient of friction, and N is the normal force (often equal to weight on a flat surface).
What units?: Use consistent units: if N is in newtons (N), F is in newtons. If N is in pounds, F is in pounds.

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