Friction Calculator
g = 9.81 m/s²
μ = coefficient of friction (dimensionless)
Calculation:
Results:
Friction Coefficient Reference Table
| Material Pair | Static μs | Kinetic μk |
|---|---|---|
| Steel on Steel (dry) | 0.50 – 0.80 | 0.40 – 0.60 |
| Steel on Steel (lubricated) | 0.10 – 0.20 | 0.05 – 0.15 |
| Wood on Wood | 0.25 – 0.50 | 0.20 – 0.40 |
| Rubber on Concrete | 0.60 – 0.90 | 0.50 – 0.70 |
| Rubber on Asphalt | 0.50 – 0.80 | 0.40 – 0.65 |
| Teflon on Steel | 0.04 | 0.04 |
| Leather on Metal | 0.40 – 0.60 | 0.30 – 0.50 |
| Glass on Glass | 0.90 – 1.00 | 0.40 |
| Ice on Ice | 0.10 | 0.03 |
| Copper on Steel | 0.53 | 0.36 |
| Bronze on Steel | 0.60 – 0.70 | 0.30 – 0.45 |
Frequently Asked Questions
What is the difference between static and kinetic friction?
Static friction (μs) is the force resisting the start of motion between two surfaces. Kinetic friction (μk) is the force resisting motion when surfaces are already sliding. Static friction is always greater than kinetic friction for the same material pair.
How do I calculate friction force on an inclined plane?
Enter the mass, slope angle, and friction coefficient. The calculator computes normal force (N = m·g·cos θ) and friction force (F = μ·N), then shows the net force along the slope.
What are typical friction coefficient values?
Steel on steel: 0.5-0.8 (static), 0.4-0.6 (kinetic). Wood on wood: 0.25-0.5 (static), 0.2-0.4 (kinetic). Rubber on concrete: 0.6-0.9 (static), 0.5-0.7 (kinetic). The reference table in the calculator provides common values.
Is the Friction Calculator free?
Yes. This Kod5 tool runs in the browser, requires no installation, and is free to use.