Friction Force Calculator
Friction force calculator: friction from the coefficient of friction and normal force, or the coefficient from a measured force.
Ff = μ · N
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
F = μN. Static friction (before sliding) is usually higher than kinetic friction. Typical μ: rubber on dry asphalt 0.7–0.9, wood on wood 0.3–0.5.
Formula
Ff = μ · N
| Symbol | Quantity | Units |
|---|---|---|
| μ | Coefficient of friction | — |
| N | Normal force (m·g on a flat surface) | N, kN, mN, dyn, lbf, kgf |
| Ff | Friction force | N, kN, mN, dyn, lbf, kgf |
Worked example
Given: μ = 0.4 · N = 500 N
Ff = μ N
Result: Ff = 200 N
Friction force for different values of Coefficient of friction
| μ · Coefficient of friction | Ff · Friction force |
|---|---|
| 0.2 | 100 N |
| 0.3 | 150 N |
| 0.36 | 180 N |
| 0.4 | 200 N |
| 0.44 | 220 N |
| 0.5 | 250 N |
| 0.6 | 300 N |
| 0.8 | 400 N |
Other values as in the worked example.
Frequently asked questions
μ = 0.4 and N = 500 N?
200 N of friction.
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