Tribology

Tribology is the study of friction, lubrication and wear of surfaces in relative motion. Because of the desire to produce efficient machines where the loss of energy due to friction is minimal, extensive research and effort has been put into studying tribology.As a subject it has considerable interrelationships and crossover with materials
and fluid mechanics.The study and reduction of friction has been of concern to humans for as long as machines have been in use and the subject of tribology includes consideration of machine elements such as bearings, gears, belts, chains, clutches, brakes and seals.