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