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A fact from Friction appeared on Wikipedia's Main Page in the Did you know column on 28 February 2004. The text of the entry was as follows:
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Article merged: See old talk-page here
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The reference to the NASA document: Barrett, Richard T. (1 March 1990). "(NASA-RP-1228) Fastener Design Manual" This is used as a source for the static and dynamic friction of wood and other materials. This document has absolutely nothing to do with friction and includes no such reference data. 149.167.140.87 (talk) 03:31, 20 February 2021 (UTC)
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The description of normal reaction N is completely wrong. N is NOT the the force that compresses the two surfaces together. N is a pair of electrostatic repulsion when the surfaces are brought in contact. The statement that N=mg is also partially incorrect since it is only true on a horizontal flat surface. On an incline plane N=mg cos(theta) where theta is the angle of incline. One should also explain that the statement N=mg does NOT mean that these the normal reaction is the same as gravity. The ambiguity must be explained; the magnitude of normal reaction is equal to the magnitude of gravity (on flat horizontal plane) but N and mg are two forces acting on two different points of action (mg acts at center of mass and N acts at a point of surface of contact), the direction of gravity is opposite of direction of N AND the nature of gravity and N are different (gravity & electrostatic force). These big mistakes must be corrected. They mis-inform physics students Pari-sterzinger (talk) 02:13, 17 June 2021 (UTC)
I don't see any particular reason for "Friction Acoustics" to be an independent article at this time. I recommend merging into the section under "Energy of friction" Polyamorph (talk) 13:17, 3 February 2022 (UTC)
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Plinius the elder and Vitruvius are Romans not Greeks and not even remotely contemporary. 151.35.217.119 (talk) 14:29, 6 July 2023 (UTC)
This article was the subject of a Wiki Education Foundation-supported course assignment, between 21 August 2023 and 16 December 2023. Further details are available on the course page. Student editor(s): FranciscoCa27, Esteban282 (article contribs). Peer reviewers: ThomasDLV, GoldenGecko.
— Assignment last updated by Kmijares (talk) 22:40, 15 November 2023 (UTC)