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<blockquote data-quote="Umbran" data-source="post: 9323049" data-attributes="member: 177">Very well, then, let's get back to it...Well, no, but it is ubiquitous in human existence.So, this is backwards.Yes, surface roughness enters into it.&nbsp; In the best models of friction, when two materials slide along each other, the microscopic peaks of their rough surface collide (Image Credit: modified from <a href="https://commons.wikimedia.org/w/index.php?curid=88520959" target="_blank">TotoBaggins, Mckdandy (CC BY-SA 3.0)</a>)...[ATTACH=full]359119[/ATTACH]In order to get past each other, those peaks must deform slightly.&nbsp; That deformation takes energy - a bit of the kinetic energy of the moving materials.&nbsp; And that work of flexing warms the surface - and effectively the kinetic energy is converted to heat.&nbsp; That warming is a result of friction though, and not a cause.It is unclear what this is supposed to mean.&nbsp; The human body mostly warms itself through chemical oxidation processes - effectively by burning sugars, mostly.Oh, no.&nbsp; Your body's cells have molecules (Cell Adhesion Molecules - CAMs) on them that connect to molecules on neighboring cells.&nbsp; Those intermolecular bonds are not about surface roughness, but about more direct intermolecular forces - just a little bit short of outright chemical bonds.&nbsp; That's generally stronger than the interactions of friction.</blockquote>

[QUOTE="Umbran, post: 9323049, member: 177"] Very well, then, let's get back to it... Well, no, but it is ubiquitous in human existence. So, this is backwards. Yes, surface roughness enters into it. In the best models of friction, when two materials slide along each other, the microscopic peaks of their rough surface collide (Image Credit: modified from [URL='https://commons.wikimedia.org/w/index.php?curid=88520959']TotoBaggins, Mckdandy (CC BY-SA 3.0)[/URL])... [ATTACH type="full" width="423px" alt="1713646184279.png"]359119[/ATTACH] In order to get past each other, those peaks must [I]deform[/I] slightly. That deformation takes energy - a bit of the kinetic energy of the moving materials. And that work of flexing warms the surface - and effectively the kinetic energy is converted to heat. That warming is a [I]result[/I] of friction though, and not a cause. It is unclear what this is supposed to mean. The human body mostly warms itself through chemical oxidation processes - effectively by burning sugars, mostly. Oh, no. Your body's cells have molecules (Cell Adhesion Molecules - CAMs) on them that connect to molecules on neighboring cells. Those intermolecular bonds are not about surface roughness, but about more direct intermolecular forces - just a little bit short of outright chemical bonds. That's generally stronger than the interactions of friction. [/QUOTE]

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