For rubber on tarmac close to 1 0.
Rubber wood coefficient of friction.
Hard plastic on dry wood.
Soft rubber on dry wood.
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.
Hard rubber on dry concrete.
The friction force of a 100 lbwooden crate pushed across a concrete floor with friction coefficient of 0 62 can be calculated as.
Hard rubber on dry wood.
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 static and kinetic friction coefficient values reference table shown in this article will be helpful for finding the cof values of commonly used materials.
Static and kinetic coefficient of friction.
The frictional force can be expressed as.
Hard plastic on dry concrete.
However it is possible to find tables in the literature for friction coefficients between various materials.
In your case build a ramp made of wood and place a sample of the rubber material on the ramp.
The coefficient of friction is the ratio of a force to a force and hence has no units.
For example ice on steel has a low coefficient of friction while rubber on pavement has a high coefficient of friction.
Coefficients of friction between materials are best determined through testing.
For example static friction can prevent an object from sliding down a sloped surface.
Where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction.
Soft plastic on dry concrete.
A good way to determine the coefficient of friction is to do a test with the actual materials.
Soft rubber on dry concrete.
Coefficients of friction range from near zero to greater than one.
Static friction is friction between two or more solid objects that are not moving relative to each other.
The value of μ s is generally higher than the value of μ k for a given combination of materials.
μ static μ s or kinetic μ k frictional coefficient.
The maximum force of static friction can be calculated by multiplying the normal force by the coefficient of friction specific to the pair of materials in contact.
N normal force between the surfaces n lb there are at least two types of friction forces.
Showing the concept of coefficient of friction.
Now slowly increase the angle of the ramp until the rubber just begins to slip.
Ff 0 62 100 lb 62 lb 1 lb 0 4536 kg example car stopping distance.
The dynamic coefficient of friction are.
For polished oiled metal surfaces less than 0 1.
Typical values for the coefficient of friction when sliding is occurring i e.
The coefficient of friction depends on the materials used.
For glass on glass 0 4.
