Traction can also refer to the `` maximum '' tractive force between a body and a surface , as limited by available friction ; when this is the case , traction is often expressed as the ratio of the maximum tractive force to the normal force and is termed the `` coefficient of traction '' ( similar to coefficient of friction ) .
Traction can also mean the maximum tractive force between a body and a surface , as limited by available friction . When this is the case , traction is often expressed as the ratio of the maximum tractive force to the normal force and is termed the `` coefficient of traction '' ( similar to coefficient of friction ) .