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Traction (engineering)
Traction, or tractive force, is the force used to generate motion between a body and a tangential surface, through the use of dry friction, though the use of shear force of the surface is also commonly used.〔Evaluating Vehicle Mobility Using Bekker's Equations, U.S. Army TARDEC, dated 2000, http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA457941〕〔Estimating Excavation, Craftsman Book Co, Deryl Burch, 1997, ISBN 0-934041-96-2, ISBN 978-0-934041-96-6, Page 215. Google books link: ()〕〔http://hyperphysics.phy-astr.gsu.edu/hbase/frict2.html〕
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).
==Definitions==
Traction is defined as: A physical process in which a tangential force is transmitted across an interface between two bodies through dry friction or an intervening fluid film resulting in motion, stoppage or the transmission of power〔Mechanical Wear Fundamentals and Testing, Raymond George Bayer, CRC Press, ISBN 0-8247-4620-1, ISBN 978-0-8247-4620-9, Page 3. Google books link: ()〕 (Copyright: "Mechanical Wear Fundamentals and Testing" by Raymond George Bayer)
In vehicle dynamics, tractive force is closely related to the terms tractive effort and drawbar pull, though all three terms have different definitions.
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