A diagram of friction showing force normal R or "contact force", a horizontal force B, being applied to the body with the intention of moving it, and a resisting force F that arises to resist the intended motion. [1]
In physics, friction (TR:119) is the force that resists the motion of one surface relative to another with which it is in contact. [1]

In the 18th century, ideas about what "friction" was, i.e. it's method of operation to produce heat or fire, tended to concern various "matter theories of heat", i.e. that the rubbing worked to release heat particles, e.g. phlogiston, terra pinguis, or caloric.

In 1798, Benjamin Thompson performed his famous "cannon boring experiment", the results of which published in his "An Inquiry Concerning the Source of Heat which is Excited by Friction", wherein he showed that the caloric theory of heat was faulty, and that friction was something that increased the motion of the particles of the bodies being rubbed, not something that released "caloric" particles. This eventually led to the kinetic theory or kinetic theory of heat.

See also
Social friction

1. Daintith, John. (2004). Oxford Dictionary of Physics (pg. 194). Oxford University Press.

External links
Friction – Wikipedia.

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