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  2. List of dimensionless quantities - Wikipedia

    en.wikipedia.org/wiki/List_of_dimensionless...

    Coefficient of kinetic friction: mechanics (friction of solid bodies in translational motion) Coefficient of static friction: mechanics (friction of solid bodies at rest) Föppl–von Kármán number =

  3. Tribometer - Wikipedia

    en.wikipedia.org/wiki/Tribometer

    Pneumatic tribometer Static Friction Tribometer Hydrogen Tribometer. A tribometer is an instrument that measures tribological quantities, such as coefficient of friction, friction force, and wear volume, between two surfaces in contact. It was invented by the 18th century Dutch scientist Musschenbroek [1] [2]

  4. Tribology - Wikipedia

    en.wikipedia.org/wiki/Tribology

    In systems with significant nonuniform stress fields, the macroscopic static friction coefficient depends on the external pressure, system size, or shape because local slip occurs before the system slides. [18] The following table shows the values of the static and dynamic friction coefficients for common materials:

  5. Floor slip resistance testing - Wikipedia

    en.wikipedia.org/wiki/Floor_slip_resistance_testing

    ANSI/NFSI B101.1-2009 was allowed to expire because it's a static coefficient of friction test, which measures how slippery a floor is to someone standing still on it. All static tests, such as ASTM D2047, ASTM C1028, ASTM F1678 and ANSI/NFSI B101.1 have been shown to lack any correlation to real-world floor slip potential. [19]

  6. File:Coefficient of friction of fabrics (IA ...

    en.wikipedia.org/wiki/File:Coefficient_of...

    Recoded by LuraDocument PDF v2.53: Encrypted: no: Page size: 360 x 595 pts; 353 x 589 pts; 342 x 594 pts; 352 x 596 pts; 356 x 601 pts; 364 x 615 pts; 369 x 618 pts; 353 x 594 pts; 346 x 600 pts; Version of PDF format: 1.5

  7. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    For example, static friction can prevent an object from sliding down a sloped surface. The coefficient of static friction, typically denoted as μ s, is usually higher than the coefficient of kinetic friction. Static friction is considered to arise as the result of surface roughness features across multiple length scales at solid surfaces.

  8. Angle of repose - Wikipedia

    en.wikipedia.org/wiki/Angle_of_repose

    If the coefficient of static friction μ s is known of a material, then a good approximation of the angle of repose can be made with the following function. This function is somewhat accurate for piles where individual objects in the pile are minuscule and piled in random order.

  9. Sommerfeld number - Wikipedia

    en.wikipedia.org/wiki/Sommerfeld_number

    Nikolai Pavlovich Petrov's method of lubrication analysis, which assumes a concentric shaft and bearing, was the first to explain the phenomenon of bearing friction.This method, which ultimately produces the equation known as Petrov's law (or Petroff's law), is useful because it defines groups of relevant dimensionless parameters, and predicts a fairly accurate coefficient of friction, even ...