Coefficient Of Static Friction Rubber On Asphalt

Jones and childers report coefficients of friction of about 0 7 for dry roads and 0 4 for wet roads.

Coefficient of static friction rubber on asphalt. For example static friction can prevent an object from sliding down a sloped surface. The tread design represents an all weather compromise. Where g is the gravitational acceleration v is the initial velocity when the brakes are applied and f r is the rolling resistance coefficient and was assume to be equal to 0 013. E is the euler number and is equal to 2 718281828.

A common value for k for production car is 0 0000658 s 2 m 2. The results show that an average friction of 70 is observed across all the samples with a range of up to 1 2 in metal to asphalt interaction without gouging. N normal force between the surfaces n lb there are at least two types of friction forces. F f μ n 1.

μ static μ s or kinetic μ k frictional coefficient. Rubber dry asphalt 0 9 0 5 0 8 1 rubber wet asphalt 0 25 0 751 rubber dry concrete 0 6 0 851 rubber wet concrete 0 45 0 751. The friction force is the force exerted by a surface when an object moves across it or makes an effort to move across it. Modern asphalt thin surface course layers with small coarse aggregate sizes which have relatively low texture depth locked wheel friction decreases with speed but not to the extent expected from other hma or pcc surfaces with comparably low macrotexture.

Rubber on concrete dry 0 68. Rubber on concrete wet 0 58. Rubber on asphalt dry 0 68. 1 1 1 1 1 1 10 100 ft 10 6 10 5 10 4 10 3 10 2 10 1 10 0 10 1 m e y e r e h e.

Then the static coefficient of friction is often significantly lower than the average quoted dynamic value. 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 tread design represents an all weather compromise.

The rolling resistance of a car with weight 1500 kg on asphalt with rolling friction coefficient 0 03 can be estimated as fr 0 03 1500 kg 9 81 m s2 441 n 0 44 kn.