The sliding lubricated values must be used with extreme care.
Rubber coefficient of friction table.
Material contact properties table the table below shows material types and their commonly used values for the dynamic coefficient of friction and restitution.
F r rolling resistance or rolling friction n lb f c rolling resistance coefficient dimensionless coefficient of rolling friction crf w m a g normal force or weight of the body n lb f m mass of body kg lb a g acceleration of gravity 9 81 m s 2 32 174 ft s 2 the rolling resistance can alternatively be expressed as.
μ static μ s or kinetic μ k frictional coefficient.
For example static friction can prevent an object from sliding down a sloped surface.
Coefficients of friction between materials are best determined through testing.
F f μ n 1.
The friction force is the force exerted by a surface when an object moves across it or makes an effort to move across it.
The frictional force can be expressed as.
The coefficient depends on temperature and other things.
All values are approximate and are only suitable for guidance only.
However it is possible to find tables in the literature for friction coefficients between various materials.
N normal force between the surfaces n lb there are at least two types of friction forces.
The static and kinetic friction coefficient values reference table shown in this article will be helpful for finding the cof values of commonly used materials.
Rubber doesn t have a single constant coefficient of friction.
References learn more about contacts.
Static and kinetic coefficient of friction.
Showing the concept of coefficient of friction.
Dry steel dry steel 0 70 0 57 0 80 greasy steel dry steel 0 23 0 16 0 90.
Material 1 material 2 coefficient of friction.
A table below shows approximate friction coefficients for various materials.
The coefficient of static friction typically denoted as μ s is usually higher than the coefficient of kinetic friction.
The only way to determine the accurate coefficient of friction between two materials is to conduct experiments.
The table of values.
Friction coefficient table for various material pairs in atmosphere and vacuum see the definition of friction coefficient is shown below the data was collected from various sources 1 2 3.
The value of μ s is generally higher than the value of μ k for a given combination of materials.
Friction coefficient table of solid lubricants metals plastics and anti friction materials.
Coefficient of friction dry lubricated test method static sliding static sliding note.
Static friction is friction between two or more solid objects that are not moving relative to each other.
