Static friction is the force between two objects that are not moving
relative to each other. For moving objects, please check Kinetic Friction
Calculator.
Static friction calculation formula:
static friction = static friction coeffient * normal force
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| Dry and Clean |
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| Aluminum | Aluminum |
1.05-1.35
|
1.4
|
0.3
| |
| Aluminum | Mild Steel |
0.61
|
0.47
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| Brake Material | Cast Iron |
0.4
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| Brake Material | Cast Iron (Wet) |
0.2
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| Brass | Cast Iron |
0.3
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| Brick | Wood |
0.6
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| Bronze | Cast Iron |
0.22
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| Bronze | Steel |
0.16
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| Cadmium | Cadmium |
0.5
|
0.05
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| Cadmium | Mild Steel |
0.46
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| Cast Iron | Cast Iron |
1.1
|
0.15
|
0.07 | |
| Cast Iron | Oak |
0.49
|
0.075 | ||
| Chromium | Chromium |
0.41
|
0.34
| ||
| Copper | Cast Iron |
1.05
|
0.29
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| Copper | Copper |
1.0
|
0.08
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| Copper | Mild Steel |
0.53
|
0.36
|
0.18 | |
| Copper-Lead Alloy | Steel |
0.22
|
-
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| Diamond | Diamond |
0.1
|
0.05 - 0.1
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| Diamond | Metal |
0.1 -0.15
|
0.1
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| Glass | Glass |
0.9 - 1.0
|
0.4
|
0.1 - 0.6
|
0.09-0.12 |
| Glass | Metal |
0.5 - 0.7
|
0.2 - 0.3
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| Glass | Nickel |
0.78
|
0.56
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| Graphite | Graphite |
0.1
|
0.1
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| Graphite | Steel |
0.1
|
0.1
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| Graphite (In vacuum) | Graphite (In vacuum) |
0.5 - 0.8
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| Hard Carbon | Hard Carbon |
0.16
|
0.12 - 0.14
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| Hard Carbon | Steel |
0.14
|
0.11 - 0.14
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| Iron | Iron |
1.0
|
0.15 - 0.2
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| Lead | Cast Iron |
0.43
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| Leather | Wood |
0.3 - 0.4
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| Leather | Metal(Clean) |
0.6
|
0.2
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| Leather | Metal(Wet) |
0.4
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| Leather | Oak (Parallel grain) |
0.61
|
0.52
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| Magnesium | Magnesium |
0.6
|
0.08
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| Nickel | Nickel |
0.7-1.1
|
0.53
|
0.28
|
0.12 |
| Nickel | Mild Steel |
0.64;
|
0.178 | ||
| Nylon | Nylon |
0.15 - 0.25
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| Oak | Oak (parallel grain) |
0.62
|
0.48
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| Oak | Oak (cross grain) |
0.54
|
0.32
|
0.072 | |
| Platinum | Platinum |
1.2
|
0.25
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| Plexiglas | Plexiglas |
0.8
|
0.8
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| Plexiglas | Steel |
0.4 - 0.5
|
0.4 - 0.5
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| Polystyrene | Polystyrene |
0.5
|
0.5
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| Polystyrene | Steel |
0.3-0.35
|
0.3-0.35
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| Polythene | Steel |
0.2
|
0.2
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| Rubber | Asphalt (Dry) |
0.5-0.8
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| Rubber | Asphalt (Wet) |
0.25-0.0.75
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| Rubber | Concrete (Dry) |
0.6-0.85
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| Rubber | Concrete (Wet) |
0.45-0.75
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| Saphire | Saphire |
0.2
|
0.2
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| Silver | Silver |
1.4
|
0.55
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| Sintered Bronze | Steel |
-
|
0.13
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| Solids | Rubber |
1.0 - 4.0
|
--
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| Steel | Aluminium Bros |
0.45
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| Steel | Brass |
0.35
|
0.19
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| Steel(Mild) | Brass |
0.51
|
0.44
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| Steel (Mild) | Cast Iron |
0.23
|
0.183
|
0.133 | |
| Steel | Cast Iron |
0.4
|
0.21
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| Steel | Copper Lead Alloy |
0.22
|
0.16
|
0.145 | |
| Steel (Hard) | Graphite |
0.21
|
0.09
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| Steel | Graphite |
0.1
|
0.1
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| Steel (Mild) | Lead |
0.95
|
0.95
|
0.5
|
0.3 |
| Steel (Mild) | Phos. Bros |
0.34
|
0.173 | ||
| Steel | Phos Bros |
0.35
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| Steel(Hard) | Polythened |
0.2
|
0.2
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| Steel(Hard) | Polystyrene |
0.3-0.35
|
0.3-0.35
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| Steel (Mild) | Steel (Mild) |
0.74
|
0.57
|
0.09-0.19 | |
| Steel(Hard) | Steel (Hard) |
0.78
|
0.42
|
0.05 -0.11
|
0.029-.12 |
| Steel | Zinc (Plated on steel) |
0.5
|
0.45
|
-
|
- |
| Teflon | Steel |
0.04
|
0.04
|
0.04 | |
| Teflon | Teflon |
0.04
|
0.04
|
0.04 | |
| Tin | Cast Iron |
.32
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| Tungsten Carbide | Tungsten Carbide |
0.2-0.25
|
0.12
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| Tungsten Carbide | Steel |
0.4 - 0.6
|
0.08 - 0.2
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| Tungsten Carbide | Copper |
0.35
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| Tungsten Carbide | Iron |
0.8
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| Wood | Wood(clean) |
0.25 - 0.5
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| Wood | Wood (Wet) |
0.2
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| Wood | Metals(Clean) |
0.2-0.6
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| Wood | Metals (Wet) |
0.2
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| Wood | Brick |
0.6
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| Wood | Concrete |
0.62
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| Zinc | Zinc |
0.6
|
0.04
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| Zinc | Cast Iron |
0.85
|
0.21
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