Tribology is the Science and Technology of friction, lubrication and wear.Primarily, Mechanical Engineers and Mathematicians are concerned with this discipline. The aim of tribology is either to find the optimum film material for a given application or to predict the sequence of events when a sliding/rolling impacting is left to generate its own intervening film. In most of the lubrication theories the bearing surfaces are assumed to be smooth, which far away from being true in reality. In fact, after having some run-in and wear the bearing surfaces develop roughness. Even some times the...