Static friction is friction between two or more solid objects that are not moving relative to each other.
Rubber coefficient of friction table.
Coefficient of friction dry lubricated test method static sliding static sliding note.
The table of values.
N normal force between the surfaces n lb there are at least two types of friction forces.
Dry steel dry steel 0 70 0 57 0 80 greasy steel dry steel 0 23 0 16 0 90.
F f μ n 1.
Showing the concept of coefficient of friction.
The sliding lubricated values must be used with extreme care.
The friction force is the force exerted by a surface when an object moves across it or makes an effort to move across it.
Material 1 material 2 coefficient of friction.
The frictional force can be expressed as.
All values are approximate and are only suitable for guidance only.
Where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction.
Friction coefficient table of solid lubricants metals plastics and anti friction materials.
For example static friction can prevent an object from sliding down a sloped surface.
The coefficient of static friction typically denoted as μ s is usually higher than the coefficient of kinetic friction.
F f frictional force n lb.
The only way to determine the accurate coefficient of friction between two materials is to conduct experiments.
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.
However it is possible to find tables in the literature for friction coefficients between various materials.
Material contact properties table the table below shows material types and their commonly used values for the dynamic coefficient of friction and restitution.
The coefficient depends on temperature and other things.
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.
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.
References learn more about contacts.
Coefficients of friction between materials are best determined through testing.
Rubber doesn t have a single constant coefficient of friction.
Static and kinetic coefficient of friction.
