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Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. [7] [8] Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. [9] [10] [11] Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.
The word tribology derives from the Greek root τριβ- of the verb τρίβω, tribo, "I rub" in classic Greek, and the suffix -logy from -λογία, -logia "study of", "knowledge of". Peter Jost coined the word in 1966, [1] in the eponymous report which highlighted the cost of friction, wear and corrosion to the UK economy. [2]
The original meaning of the word still persists in some pyrotechnics terms, such as black match (a black-powder-impregnated fuse) and Bengal match (a firework akin to sparklers producing a relatively long-burning, colored flame). However, when friction matches became commonplace, the term match came to refer mainly to these.
Aircraft with tractor configuration propeller: the world's first airplane having a "Tractor" configuration, propeller on the front, was the Goupy No.2 (first flight on 11 March 1909) designed by Mario Calderara and financed by Ambroise Goupy at the French firm Blériot Aéronautique. [39] At the time, it was the fastest airplane in existence.
In the Western world, felt is widely used as a medium for expression in both textile art and contemporary art [7] and design, where it has significance as an ecologically responsible textile and building material. [13] In addition to Central Asian traditions of felting, Scandinavian countries have also supported feltmaking, particularly for ...
Fingerprint identification, known as dactyloscopy, [30] ridgeology, [31] or hand print identification, is the process of comparing two instances of friction ridge skin impressions (see minutiae), from human fingers or toes, or even the palm of the hand or sole of the foot, to determine whether these impressions could have come from the same ...
Friction of distance is a core principle of geography that states that movement incurs some form of cost, in the form of physical effort, energy, time, and/or the expenditure of other resources, and that these costs are proportional to the distance traveled.
The Rudiger roll friction fire method, also known as the "fire roll" method, is believed to have been invented by World War 2 POWs. A German survival expert named Rüdiger Nehberg wrote about this method in one of his books. A small amount of wood ash is rolled up in a piece of cotton like a cigar.