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			== Friction ==
			<gallery>
			File:Friction_Animation_2_Blocks.gif\|Friction Animation 2 Blocks
			File:Friction_between_surfaces.jpg\|Friction between surfaces
			File:Heat_by_friction.webm\|Heat by friction
			File:Free_body_diagram2.svg\|Free body diagram 2
			File:Static_kinetic_friction_vs_time.png\|Static kinetic friction vs time
			File:Free_body.svg\|Free body
			</gallery>

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'''Friction''' is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: [[Dry friction]] resists relative lateral motion of two solid surfaces in contact. [[Fluid friction]] describes the friction between layers of a viscous fluid that are moving relative to each other. [[Lubricated friction]] is a case of fluid friction where a lubricant fluid separates two solid surfaces. [[Skin friction]] is a component of drag, the force resisting the motion of a fluid across the surface of a body. [[Internal friction]] is the force resisting motion between the elements making up a solid material while it undergoes deformation.

==Types of Friction==
===Dry Friction===
[[Dry friction]] is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the [[electromagnetic]] attraction between charged particles in two touching surfaces.

===Fluid Friction===
[[Fluid friction]] occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named [[viscosity]]. In everyday terms, the viscosity of a fluid is described as its "thickness".

===Lubricated Friction===
[[Lubricated friction]] or lubrication is an aspect of fluid friction where a lubricant fluid separates two solid surfaces. Lubrication is a technique employed to reduce wear of one or both surfaces in close proximity, and moving relative to each another, by interposing a substance called lubricant between the surfaces to carry or to help carry the load (pressure generated) between the opposing surfaces.

===Skin Friction===
[[Skin friction]] arises from the friction of fluid layers moving against each other within the boundary layer over a body. It is a component of drag in the case of a fluid (such as air) moving past an object, such as an airplane wing or the body of a car.

===Internal Friction===
[[Internal friction]] is the force resisting motion between the elements making up a solid material while it undergoes deformation. It is caused by the frictional resistance between the particles of a body, and it increases with the hardness of the material.

==See Also==
* [[Friction welding]]
* [[Friction stir welding]]
* [[Friction tape]]
* [[Friction loss]]
* [[Friction drive]]
* [[Friction modifier]]

[[Category:Physics]]
[[Category:Mechanical engineering]]
[[Category:Tribology]]

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Friction - Revision history

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