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 The friction theory and friction coefficients at different conditions for various of materials like ice, aluminum, steel, graphite and other common materials and materials combinations Listerine Zero (Mouthwash): 2.1 out of 5 stars from 7 genuine reviews on Australia's largest opinion site ProductReview.com.au. Listerine Listerine 5 out of 5 stars 2 $6.99 $ 6. 99 Listerine Cool Mint Antiseptic Mouthwash for Bad Breath, Travel Size 3.2 oz - Pack of 12 4.8 out of 5 stars 70.
The friction force is the force exerted by a surface when an object moves across it - or makes an effort to move across it.
A car with mass 2000 kg drives with speed 100 km/h on a wet road with friction coefficient 0.2. The friction work required to stop the car is equal to the kinetic energy of the car.
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The frictional force can be expressed as https://truegload251.weebly.com/leo-gambling-horoscope.html.
Ff = μ N (1)
where
Ff = frictional force (N, lb)
μ = static (μs) or kinetic (μk) frictional coefficient
N = normal force between the surfaces (N, lb)
There are at least two types of friction forces
kinetic (sliding) friction force- when an object moves
static friction force - when an object makes an effort to move
For an object pulled or pushed horizontally the normal force - N - is simply the gravity force - or weight:
Snagit all in one capture. Bingo slot machine. N = Fg
 = m ag (2)
where
Fg = gravity force - or weight (N, lb)
m= mass of object (kg, slugs)
ag = acceleration of gravity (9.81 m/s2, 32ft/s2)
The friction force due to gravity (1) can with (2) be modified to
Ff = μ m ag (3)
Friction Force Calculatorm - mass (kg, slugs)
 ag - acceleration og gravity (9.81 m/s2, 32 ft/s2)
 μ - friction coefficient Nzbvortex 3 4 3 – lightweight usenet nzb download client.
Friction Coefficients for some Common Materials and Materials CombinationsMaterials and Material CombinationsSurface ConditionsFrictional Coefficient 
Static
- μstatic -Kinetic (sliding)
- μsliding -
AluminumAluminumClean and Dry1.05 - 1.351.4
AluminumAluminumLubricated and Greasy0.3
Aluminum-bronzeSteelClean and Dry0.45
AluminumMild SteelClean and Dry0.610.47
AluminumSnowWet 0oC0.4
AluminumSnowDry 0oC0.35
Brake material2)Cast ironClean and Dry0.4
Brake material2)Cast iron (wet)Clean and Dry0.2
BrassSteelClean and Dry0.510.44
BrassSteelLubricated and Greasy0.19
BrassSteelCastor oil0.11
BrassCast IronClean and Dry0.3
BrassIceClean 0oC0.02
BrassIceClean -80oC0.15
BrickWoodClean and Dry0.6
BronzeSteelLubricated and Greasy0.16
BronzeCast IronClean and Dry0.22
Bronze - sinteredSteelLubricated and Greasy0.13
CadmiumCadmiumClean and Dry0.5
CadmiumCadmiumLubricated and Greasy0.05
CadmiumChromiumClean and Dry0.41
CadmiumChromiumLubricated and Greasy0.34
CadmiumMild SteelClean and Dry0.46
Cast IronCast IronClean and Dry1.10.15
Cast IronCast IronClean and Dry0.15
Cast IronCast IronLubricated and Greasy0.07
Cast IronOakClean and Dry0.49
Cast IronOakLubricated and Greasy0.075
Cast ironMild SteelClean and Dry0.4
Cast ironMild SteelClean and Dry0.23
Cast ironMild SteelLubricated and Greasy0.210.133
Car tireAsphaltClean and Dry0.72
Car tireGrassClean and Dry0.35
Carbon (hard)CarbonClean and Dry0.16
Carbon (hard)CarbonLubricated and Greasy0.12 - 0.14
CarbonSteelClean and Dry0.14
CarbonSteelLubricated and Greasy0.11 - 0.14
ChromiumChromiumClean and Dry0.41
ChromiumChromiumLubricated and Greasy0.34
Copper-Lead alloySteelClean and Dry0.22
CopperCopperClean and Dry1.6
CopperCopperLubricated and Greasy0.08
CopperCast IronClean and Dry1.050.29
CopperMild SteelClean and Dry0.530.36
CopperMild SteelLubricated and Greasy0.18
CopperMild SteelOleic acid0.18
CopperGlassClean and Dry0.680.53
CottonCottonThreads0.3
DiamondDiamondClean and Dry0.1
DiamondDiamondLubricated and Greasy0.05 - 0.1
DiamondMetalsClean and Dry0.1 - 0.15
DiamondMetalLubricated and Greasy0.1
GarnetSteelClean and Dry0.39
GlassGlassClean and Dry0.9 - 1.00.4
GlassGlassLubricated and Greasy0.1 - 0.60.09 - 0.12
GlassMetalClean and Dry0.5 - 0.7
GlassMetalLubricated and Greasy0.2 - 0.3
GlassNickelClean and Dry0.78
GlassNickelLubricated and Greasy0.56
GraphiteSteelClean and Dry0.1
GraphiteSteelLubricated and Greasy0.1
GraphiteGraphite (in vacuum)Clean and Dry0.5 - 0.8
GraphiteGraphiteClean and Dry0.1
GraphiteGraphiteLubricated and Greasy0.1
Hemp ropeTimberClean and Dry0.5
HorseshoeRubberClean and Dry0.68
HorseshoeConcreteClean and Dry0.58
IceIceClean 0oC0.10.02
IceIceClean -12oC0.30.035
IceIceClean -80oC0.50.09
IceWoodClean and Dry0.05
IceSteelClean and Dry0.03
IronIronClean and Dry1.0
IronIronLubricated and Greasy0.15 - 0.20
LeadCast IronClean and Dry0.43
LeatherOakParallel to grain0.610.52
LeatherMetalClean and Dry0.4
LeatherMetalLubricated and Greasy0.2
LeatherWoodClean and Dry0.3 - 0.4
LeatherClean MetalClean and Dry0.6
LeatherCast IronClean and Dry0.60.56
Leather fiber Cast ironClean and Dry0.31
Leather fiberAluminumClean and Dry0.30
MagnesiumMagnesiumClean and Dry0.6
MagnesiumMagnesiumLubricated and Greasy0.08
MagnesiumSteelClean and Dry0.42
MagnesiumCast IronClean and Dry0.25
MasonryBrickClean and Dry0.6 - 0.7
MicaMicaFreshly cleaved1.0
NickelNickelClean and Dry0.7 - 1.10.53
NickelNickelLubricated and Greasy0.280.12
NickelMild SteelClean and Dry0.64
NickelMild SteelLubricated and Greasy0.178
NylonNylonClean and Dry0.15 - 0.25
NylonSteelClean and Dry0.4
NylonSnowWet 0oC0.4
NylonSnowDry -10oC0.3
OakOak (parallel grain)Clean and Dry0.620.48
OakOak (cross grain)Clean and Dry0.540.32
OakOak (cross grain)Lubricated and Greasy0.072
PaperCast IronClean and Dry0.20
Phosphor-bronzeSteelClean and Dry0.35
PlatinumPlatinumClean and Dry1.2
PlatinumPlatinumLubricated and Greasy0.25
PlexiglasPlexiglasClean and Dry0.8
PlexiglasPlexiglasLubricated and Greasy0.8
PlexiglasSteelClean and Dry0.4 - 0.5
PlexiglasSteelLubricated and Greasy0.4 - 0.5
PolystyrenePolystyreneClean and Dry0.5
PolystyrenePolystyreneLubricated and Greasy0.5
PolystyreneSteelClean and Dry0.3 - 0.35
PolystyreneSteelLubricated and Greasy0.3 - 0.35
PolyethylenePolytehyleneClean and Dry0.2
PolyethyleneSteelClean and Dry0.2
PolyethyleneSteelLubricated and Greasy0.2
RubberRubberClean and Dry1.16
RubberCardboardClean and Dry0.5 - 0.8
RubberDry AsphaltClean and Dry0.90.5 - 0.8
RubberWet AsphaltClean and Dry0.25 - 0.75
RubberDry ConcreteClean and Dry0.6 - 0.85
RubberWet ConcreteClean and Dry0.45 - 0.75
SilkSilkClean0.25
SilverSilverClean and Dry1.4
SilverSilverLubricated and Greasy0.55
SapphireSapphireClean and Dry0.2
SapphireSapphireLubricated and Greasy0.2
SilverSilverClean and Dry1.4
SilverSilverLubricated and Greasy0.55
SkinMetalsClean and Dry0.8 - 1.0
SteelSteelClean and Dry0.5 - 0.80.42
SteelSteelLubricated and Greasy0.16
SteelSteelCastor oil0.150.081
SteelSteelStearic Acid0.15
SteelSteelLight mineral oil0.23
SteelSteelLard0.110.084
SteelSteelGraphite0.058
SteelGraphiteClean and Dry0.21
Straw FiberCast IronClean and Dry0.26
Straw Fiber AluminumClean and Dry0.27
Tarred fiberCast IronClean and Dry0.15
Tarred fiberAluminumClean and Dry0.18
Polytetrafluoroethylene (PTFE) (Teflon)Polytetrafluoroethylene (PTFE)Clean and Dry0.040.04
Polytetrafluoroethylene (PTFE)Polytetrafluoroethylene (PTFE)Lubricated and Greasy0.04
Polytetrafluoroethylene (PTFE)SteelClean and Dry0.05 - 0.2
Polytetrafluoroethylene (PTFE)SnowWet 0oC0.05
Polytetrafluoroethylene (PTFE)SnowDry 0oC0.02
Tungsten CarbideSteelClean and Dry0.4 - 0.6
Tungsten CarbideSteelLubricated and Greasy0.1 - 0.2
Tungsten CarbideTungsten CarbideClean and Dry0.2 - 0.25
Tungsten CarbideTungsten CarbideLubricated and Greasy0.12
Tungsten CarbideCopperClean and Dry0.35
Tungsten CarbideIronClean and Dry0.8
TinCast IronClean and Dry0.32
Tire, dryRoad, dryClean and Dry1
Tire, wetRoad, wetClean and Dry0.2
Wax, skiSnowWet 0oC0.1
Wax, skiSnowDry 0oC0.04
Wax, skiSnowDry -10oC0.2
WoodClean WoodClean and Dry0.25 - 0.5
WoodWet WoodClean and Dry0.2
WoodClean MetalClean and Dry0.2 - 0.6
WoodWet MetalsClean and Dry0.2
WoodStoneClean and Dry0.2 - 0.4
WoodConcreteClean and Dry0.62
WoodBrickClean and Dry0.6
Wood - waxedWet snowClean and Dry0.140.1
Wood - waxedDry snowClean and Dry0.04
ZincCast IronClean and Dry0.850.21
ZincZincClean and Dry0.6
ZincZincLubricated and Greasy0.04
Kinetic or sliding frictional coefficient only when there is a relative motion between the surfaces.
Note! It is commonly thought that the static coefficients of friction are higher than the dynamic or kinetic values. This is a very simplistic statement and quite misleading for brake materials. With many brake materials the dynamic coefficient of friction quoted is an 'average' value when the material is subject to a range of sliding speeds, surface pressures and most importantly operating temperatures. If the static situation is considered at the same pressure, but at ambient temperature, then the static coefficient of friction is often significantly LOWER than the average quoted dynamic value. It can be as low as 40 - 50% of the quoted dynamic value.
Kinetic (Sliding) versus Static Frictional CoefficientsKinetic or sliding frictional coefficients are used with relative motion between objects. Static frictional coefficients are used for objects without relative motion. Note that static coefficients are somewhat higher than the kinetic or sliding coefficients. More force are required to start a motion
Listerine 0 2 FlourExample - Friction ForceA 100 lb wooden crate is pushed across a concrete floor. The friction coefficient between the object and the surface is 0.62. The friction force can be calculated as
Ff = 0.62 (100 lb)
 = 62 (lb)
1 lb = 0.4536 kg
Example - Car, Braking, Friction Force and Required Distance to StopA car with mass 2000 kg drives with speed 100 km/h on a wet road with friction coefficient 0.2.
Note! - The friction work required to stop the car is equal to the kinetic energy of the car. 
The kinetic energy of the car is
Ekinetic = 1/2 m v2 (4)
where 
Ekinetic = kinetic energy of the moving car (J)
m = mass (kg)
v = velocity (m/s)

Ekinetic= 1/2 (2000 kg) ((100 km/h) (1000 m/km) / (3600 s/h))2
 = 771605 J
The friction work (energy) to stop the car can be expressed as
Wfriction = Ff d (5)
where 
Wfriction = friction work to stop the car (J)
Ff= friction force (N)
d = braking (stopping) distance (m)
Since the kinetic energy of the car is converted to friction energy (work) - we have the expression
Ekinetic = Wfriction (6)
The friction force Ff can be calculated from (3) 
Ff= μ m g 
 = 0.2 (2000 kg) (9.81 m/s2)
 = 3924 N
The stop distance for the car can be calculated by modifying (5) to 
d = Wfriction / Ff
 = (771605 J) / (3924 N)
 = 197 m
Note! - since the mass of the car is present on both sides of eq. 6 it cancels out. The stop distance is not dependent on the mass of the car.

Materials and Material Combinations	Surface Conditions	Frictional Coefficient
Static - μ_static-	Kinetic (sliding) - μ_sliding-
Aluminum	Aluminum	Clean and Dry	1.05 - 1.35	1.4
Aluminum	Aluminum	Lubricated and Greasy	0.3
Aluminum-bronze	Steel	Clean and Dry	0.45
Aluminum	Mild Steel	Clean and Dry	0.61	0.47
Aluminum	Snow	Wet 0^oC	0.4
Aluminum	Snow	Dry 0^oC	0.35
Brake material²⁾	Cast iron	Clean and Dry	0.4
Brake material²⁾	Cast iron (wet)	Clean and Dry	0.2
Brass	Steel	Clean and Dry	0.51	0.44
Brass	Steel	Lubricated and Greasy	0.19
Brass	Steel	Castor oil	0.11
Brass	Cast Iron	Clean and Dry	0.3
Brass	Ice	Clean 0^oC	0.02
Brass	Ice	Clean -80^oC	0.15
Brick	Wood	Clean and Dry	0.6
Bronze	Steel	Lubricated and Greasy	0.16
Bronze	Cast Iron	Clean and Dry	0.22
Bronze - sintered	Steel	Lubricated and Greasy	0.13
Cadmium	Cadmium	Clean and Dry	0.5
Cadmium	Cadmium	Lubricated and Greasy	0.05
Cadmium	Chromium	Clean and Dry	0.41
Cadmium	Chromium	Lubricated and Greasy	0.34
Cadmium	Mild Steel	Clean and Dry	0.46
Cast Iron	Cast Iron	Clean and Dry	1.1	0.15
Cast Iron	Cast Iron	Clean and Dry	0.15
Cast Iron	Cast Iron	Lubricated and Greasy	0.07
Cast Iron	Oak	Clean and Dry	0.49
Cast Iron	Oak	Lubricated and Greasy	0.075
Cast iron	Mild Steel	Clean and Dry	0.4
Cast iron	Mild Steel	Clean and Dry	0.23
Cast iron	Mild Steel	Lubricated and Greasy	0.21	0.133
Car tire	Asphalt	Clean and Dry	0.72
Car tire	Grass	Clean and Dry	0.35
Carbon (hard)	Carbon	Clean and Dry	0.16
Carbon (hard)	Carbon	Lubricated and Greasy	0.12 - 0.14
Carbon	Steel	Clean and Dry	0.14
Carbon	Steel	Lubricated and Greasy	0.11 - 0.14
Chromium	Chromium	Clean and Dry	0.41
Chromium	Chromium	Lubricated and Greasy	0.34
Copper-Lead alloy	Steel	Clean and Dry	0.22
Copper	Copper	Clean and Dry	1.6
Copper	Copper	Lubricated and Greasy	0.08
Copper	Cast Iron	Clean and Dry	1.05	0.29
Copper	Mild Steel	Clean and Dry	0.53	0.36
Copper	Mild Steel	Lubricated and Greasy	0.18
Copper	Mild Steel	Oleic acid	0.18
Copper	Glass	Clean and Dry	0.68	0.53
Cotton	Cotton	Threads	0.3
Diamond	Diamond	Clean and Dry	0.1
Diamond	Diamond	Lubricated and Greasy	0.05 - 0.1
Diamond	Metals	Clean and Dry	0.1 - 0.15
Diamond	Metal	Lubricated and Greasy	0.1
Garnet	Steel	Clean and Dry	0.39
Glass	Glass	Clean and Dry	0.9 - 1.0	0.4
Glass	Glass	Lubricated and Greasy	0.1 - 0.6	0.09 - 0.12
Glass	Metal	Clean and Dry	0.5 - 0.7
Glass	Metal	Lubricated and Greasy	0.2 - 0.3
Glass	Nickel	Clean and Dry	0.78
Glass	Nickel	Lubricated and Greasy	0.56
Graphite	Steel	Clean and Dry	0.1
Graphite	Steel	Lubricated and Greasy	0.1
Graphite	Graphite (in vacuum)	Clean and Dry	0.5 - 0.8
Graphite	Graphite	Clean and Dry	0.1
Graphite	Graphite	Lubricated and Greasy	0.1
Hemp rope	Timber	Clean and Dry	0.5
Horseshoe	Rubber	Clean and Dry	0.68
Horseshoe	Concrete	Clean and Dry	0.58
Ice	Ice	Clean 0^oC	0.1	0.02
Ice	Ice	Clean -12^oC	0.3	0.035
Ice	Ice	Clean -80^oC	0.5	0.09
Ice	Wood	Clean and Dry	0.05
Ice	Steel	Clean and Dry	0.03
Iron	Iron	Clean and Dry	1.0
Iron	Iron	Lubricated and Greasy	0.15 - 0.20
Lead	Cast Iron	Clean and Dry	0.43
Leather	Oak	Parallel to grain	0.61	0.52
Leather	Metal	Clean and Dry	0.4
Leather	Metal	Lubricated and Greasy	0.2
Leather	Wood	Clean and Dry	0.3 - 0.4
Leather	Clean Metal	Clean and Dry	0.6
Leather	Cast Iron	Clean and Dry	0.6	0.56
Leather fiber	Cast iron	Clean and Dry	0.31
Leather fiber	Aluminum	Clean and Dry	0.30
Magnesium	Magnesium	Clean and Dry	0.6
Magnesium	Magnesium	Lubricated and Greasy	0.08
Magnesium	Steel	Clean and Dry	0.42
Magnesium	Cast Iron	Clean and Dry	0.25
Masonry	Brick	Clean and Dry	0.6 - 0.7
Mica	Mica	Freshly cleaved	1.0
Nickel	Nickel	Clean and Dry	0.7 - 1.1	0.53
Nickel	Nickel	Lubricated and Greasy	0.28	0.12
Nickel	Mild Steel	Clean and Dry	0.64
Nickel	Mild Steel	Lubricated and Greasy	0.178
Nylon	Nylon	Clean and Dry	0.15 - 0.25
Nylon	Steel	Clean and Dry	0.4
Nylon	Snow	Wet 0^oC	0.4
Nylon	Snow	Dry -10^oC	0.3
Oak	Oak (parallel grain)	Clean and Dry	0.62	0.48
Oak	Oak (cross grain)	Clean and Dry	0.54	0.32
Oak	Oak (cross grain)	Lubricated and Greasy	0.072
Paper	Cast Iron	Clean and Dry	0.20
Phosphor-bronze	Steel	Clean and Dry	0.35
Platinum	Platinum	Clean and Dry	1.2
Platinum	Platinum	Lubricated and Greasy	0.25
Plexiglas	Plexiglas	Clean and Dry	0.8
Plexiglas	Plexiglas	Lubricated and Greasy	0.8
Plexiglas	Steel	Clean and Dry	0.4 - 0.5
Plexiglas	Steel	Lubricated and Greasy	0.4 - 0.5
Polystyrene	Polystyrene	Clean and Dry	0.5
Polystyrene	Polystyrene	Lubricated and Greasy	0.5
Polystyrene	Steel	Clean and Dry	0.3 - 0.35
Polystyrene	Steel	Lubricated and Greasy	0.3 - 0.35
Polyethylene	Polytehylene	Clean and Dry	0.2
Polyethylene	Steel	Clean and Dry	0.2
Polyethylene	Steel	Lubricated and Greasy	0.2
Rubber	Rubber	Clean and Dry	1.16
Rubber	Cardboard	Clean and Dry	0.5 - 0.8
Rubber	Dry Asphalt	Clean and Dry	0.9	0.5 - 0.8
Rubber	Wet Asphalt	Clean and Dry	0.25 - 0.75
Rubber	Dry Concrete	Clean and Dry	0.6 - 0.85
Rubber	Wet Concrete	Clean and Dry	0.45 - 0.75
Silk	Silk	Clean	0.25
Silver	Silver	Clean and Dry	1.4
Silver	Silver	Lubricated and Greasy	0.55
Sapphire	Sapphire	Clean and Dry	0.2
Sapphire	Sapphire	Lubricated and Greasy	0.2
Silver	Silver	Clean and Dry	1.4
Silver	Silver	Lubricated and Greasy	0.55
Skin	Metals	Clean and Dry	0.8 - 1.0
Steel	Steel	Clean and Dry	0.5 - 0.8	0.42
Steel	Steel	Lubricated and Greasy	0.16
Steel	Steel	Castor oil	0.15	0.081
Steel	Steel	Stearic Acid	0.15
Steel	Steel	Light mineral oil	0.23
Steel	Steel	Lard	0.11	0.084
Steel	Steel	Graphite	0.058
Steel	Graphite	Clean and Dry	0.21
Straw Fiber	Cast Iron	Clean and Dry	0.26
Straw Fiber	Aluminum	Clean and Dry	0.27
Tarred fiber	Cast Iron	Clean and Dry	0.15
Tarred fiber	Aluminum	Clean and Dry	0.18
Polytetrafluoroethylene (PTFE) (Teflon)	Polytetrafluoroethylene (PTFE)	Clean and Dry	0.04	0.04
Polytetrafluoroethylene (PTFE)	Polytetrafluoroethylene (PTFE)	Lubricated and Greasy	0.04
Polytetrafluoroethylene (PTFE)	Steel	Clean and Dry	0.05 - 0.2
Polytetrafluoroethylene (PTFE)	Snow	Wet 0^oC	0.05
Polytetrafluoroethylene (PTFE)	Snow	Dry 0^oC	0.02
Tungsten Carbide	Steel	Clean and Dry	0.4 - 0.6
Tungsten Carbide	Steel	Lubricated and Greasy	0.1 - 0.2
Tungsten Carbide	Tungsten Carbide	Clean and Dry	0.2 - 0.25
Tungsten Carbide	Tungsten Carbide	Lubricated and Greasy	0.12
Tungsten Carbide	Copper	Clean and Dry	0.35
Tungsten Carbide	Iron	Clean and Dry	0.8
Tin	Cast Iron	Clean and Dry	0.32
Tire, dry	Road, dry	Clean and Dry	1
Tire, wet	Road, wet	Clean and Dry	0.2
Wax, ski	Snow	Wet 0^oC	0.1
Wax, ski	Snow	Dry 0^oC	0.04
Wax, ski	Snow	Dry -10^oC	0.2
Wood	Clean Wood	Clean and Dry	0.25 - 0.5
Wood	Wet Wood	Clean and Dry	0.2
Wood	Clean Metal	Clean and Dry	0.2 - 0.6
Wood	Wet Metals	Clean and Dry	0.2
Wood	Stone	Clean and Dry	0.2 - 0.4
Wood	Concrete	Clean and Dry	0.62
Wood	Brick	Clean and Dry	0.6
Wood - waxed	Wet snow	Clean and Dry	0.14	0.1
Wood - waxed	Dry snow	Clean and Dry	0.04
Zinc	Cast Iron	Clean and Dry	0.85	0.21
Zinc	Zinc	Clean and Dry	0.6
Zinc	Zinc	Lubricated and Greasy	0.04

'Laws of Friction'Unlubricated Dry Surfacesfor low pressure the friction is proportional to the normal force between the surfaces. With rising pressure the friction will not rise proportionally. With extreme pressure friction will rise and surfaces seize.
at moderate pressure the friction force - and coefficient - is not dependent of the surface areas in contact as long as the normal force is the same. With extreme pressure friction will rice and surfaces seize.
at very low velocity between the surfaces the friction is independent of the velocity of rubbing. With increased velocity the the friction decrease.
Lubricated Surfacesfriction force is almost independent of pressure - normal force - if the surfaces are flooded with lubricant
friction varies with speed at low pressure. At higher pressure the minimum friction is at velocity 2 ft/s (0.7 m/s) and friction increases with approximately square root of velocity afterwards.
friction varies with temperature
for well lubricated surfaces the friction is almost independent of surface material
Typically steel on steel dry static friction coefficient 0.8 drops to 0.4 when sliding is initiated - and steel on steel lubricated static friction coefficient 0.16 drops to 0.04 when sliding is initiated.
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