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  2. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    The normal force and the frictional force are ultimately determined using vector analysis, usually via a free body diagram. In general, process for solving any statics problem with friction is to treat contacting surfaces tentatively as immovable so that the corresponding tangential reaction force between them can be calculated.

  3. Tribology - Wikipedia

    en.wikipedia.org/wiki/Tribology

    Tribology is the science and engineering of understanding friction, lubrication and wear phenomena for interacting surfaces in relative motion.It is highly interdisciplinary, drawing on many academic fields, including physics, chemistry, materials science, mathematics, biology and engineering. [1]

  4. Contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Contact_mechanics

    Frictional contact mechanics emphasizes the effect of friction forces. Contact mechanics is part of mechanical engineering . The physical and mathematical formulation of the subject is built upon the mechanics of materials and continuum mechanics and focuses on computations involving elastic , viscoelastic , and plastic bodies in static or ...

  5. Force - Wikipedia

    en.wikipedia.org/wiki/Force

    Friction is a force that opposes relative motion of two bodies. At the macroscopic scale, the frictional force is directly related to the normal force at the point of contact. There are two broad classifications of frictional forces: static friction and kinetic friction. [17]: 267

  6. Stokes' law - Wikipedia

    en.wikipedia.org/wiki/Stokes'_law

    In fluid dynamics, Stokes' law gives the frictional force – also called drag force – exerted on spherical objects moving at very small Reynolds numbers in a viscous fluid. [1] It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations. [2]

  7. Friction torque - Wikipedia

    en.wikipedia.org/wiki/Friction_torque

    The small black vector arrow represents the frictional force caused by the bar sliding across the second bar (grey). In mechanics, friction torque is the torque caused by the frictional force that occurs when two objects in contact move. [1] Like all torques, it is a rotational force that may be measured in newton meters or pounds-feet.

  8. Triboelectric effect - Wikipedia

    en.wikipedia.org/wiki/Triboelectric_effect

    The energy which is not recovered contributes to the back force, a process called rolling friction. Similar to rolling friction there are energy terms in charge transfer, which contribute to friction. In static friction there is coupling between elastic strains, polarization and surface charge which contributes to the frictional force. [82]

  9. Skin friction drag - Wikipedia

    en.wikipedia.org/wiki/Skin_friction_drag

    Laminar flow over a body occurs when layers of the fluid move smoothly past each other in parallel lines. In nature, this kind of flow is rare. As the fluid flows over an object, it applies frictional forces to the surface of the object which works to impede forward movement of the object; the result is called skin friction drag.