Rubber Wood Coefficient Of Friction

Hard rubber on dry concrete.

Rubber wood coefficient of friction.

For example static friction can prevent an object from sliding down a sloped surface. Coefficients of friction between materials are best determined through testing. For example ice on steel has a low coefficient of friction while rubber on pavement has a high coefficient of friction. Static and kinetic coefficient of friction.

μ static μ s or kinetic μ k frictional coefficient. The coefficient of friction is the ratio of a force to a force and hence has no units. Soft plastic on dry concrete. F f frictional force n lb.

Hard plastic on dry concrete. F f μ n 1. Hard rubber on dry wood. Where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction.

Ff 0 62 100 lb 62 lb 1 lb 0 4536 kg example car stopping distance. 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. A good way to determine the coefficient of friction is to do a test with the actual materials. For glass on glass 0 4.

For rubber on tarmac close to 1 0. Soft rubber on dry concrete. 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. 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 coefficient of friction depends on the materials used. Typical values for the coefficient of friction when sliding is occurring i e. The frictional force can be expressed as. Hard plastic on dry wood.

Soft rubber on dry wood. Now slowly increase the angle of the ramp until the rubber just begins to slip. The value of μ s is generally higher than the value of μ k for a given combination of materials. 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 dynamic coefficient of friction are. N normal force between the surfaces n lb there are at least two types of friction forces. In your case build a ramp made of wood and place a sample of the rubber material on the ramp.

However it is possible to find tables in the literature for friction coefficients between various materials. The friction force of a 100 lbwooden crate pushed across a concrete floor with friction coefficient of 0 62 can be calculated as. For polished oiled metal surfaces less than 0 1. Soft plastic on dry wood.