Editing Friction (section)

==Types==
There are several types of friction:
* '''Dry friction''' is a force that opposes the relative lateral motion of two solid surfaces in contact. 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 interaction of surface features, known as [[asperities]] (see Figure).
* '''Fluid friction''' describes the friction between layers of a [[viscous]] fluid that are moving relative to each other.<ref name="Beer-1996">{{cite book
| last1 = Beer | first1 = Ferdinand P. | author-link1 = Ferdinand Beer
| last2=Johnston |first2=E. Russel Jr.
| year = 1996
| title = Vector Mechanics for Engineers
| edition = Sixth
| publisher = McGraw-Hill
| isbn = 978-0-07-297688-5
| page = 397
}}</ref><ref name="Meriam-2002">{{cite book
| last1 = Meriam
| first1 = J. L.
| last2 = Kraige
| first2 = L. G.
| year = 2002
| title = Engineering Mechanics
| edition = fifth
| publisher = John Wiley & Sons
| isbn = 978-0-471-60293-4
| page = [https://archive.org/details/engineeringmech100meri/page/328 328]
| url-access = registration
| url = https://archive.org/details/engineeringmech100meri
}}</ref>
* '''Lubricated friction''' is a case of fluid friction where a [[lubricant]] fluid separates two solid surfaces.<ref name="Ruina-2002">{{cite book
| last1 = Ruina
| first1 = Andy
| last2 = Pratap
| first2 = Rudra
| year = 2002
| title = Introduction to Statics and Dynamics
| publisher = Oxford University Press
| page = 713
| url = http://ruina.tam.cornell.edu/Book/RuinaPratapNoProblems.pdf
| access-date = 2008-12-20
| archive-date = 2019-05-25
| archive-url = https://web.archive.org/web/20190525144127/http://ruina.tam.cornell.edu/Book/RuinaPratapNoProblems.pdf
| url-status = live
}}</ref><ref name="Hibbeler-2007">{{cite book
| last = Hibbeler | first = R. C.
| year = 2007
| title = Engineering Mechanics
| url = https://archive.org/details/studypack00rcsc | url-access = registration | edition = Eleventh
| publisher = Pearson, Prentice Hall
| isbn = 978-0-13-127146-3
| page = 393}}</ref><ref name="Soutas-Little-2008">{{cite book
| last1 = Soutas-Little
| first1 = Robert W.
| last2=Inman |first2=Balint
| year = 2008
| title = Engineering Mechanics
| publisher = Thomson
| isbn = 978-0-495-29610-2
| page = 329}}</ref>
* '''Skin friction''' is a component of [[Drag (physics)|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 (mechanics)|deformation]].<ref name="Meriam-2002"/><ref name="Ghose-2022" />