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  2. 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.

  3. Floor slip resistance testing - Wikipedia

    en.wikipedia.org/wiki/Floor_slip_resistance_testing

    Static coefficient of friction (SCOF) testing has always been unreliable for assessing safety in the wet condition, so any reliable slip resistance test will be measuring the available slip resistance to someone who is moving (dynamic) across the floor, and therefore will be assessing dynamic coefficient of friction (DCOF).

  4. List of dimensionless quantities - Wikipedia

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

    Definition Field of application Coefficient of kinetic friction: mechanics (friction of solid bodies in translational motion) Coefficient of static friction: mechanics (friction of solid bodies at rest) Dieterich-Ruina-Rice number

  5. Adhesion railway - Wikipedia

    en.wikipedia.org/wiki/Adhesion_railway

    The former is concerned with static friction (also known as "stiction" [3]) or "limiting friction", whilst the latter is dynamic friction, also called "sliding friction". For steel on steel, the coefficient of friction can be as high as 0.78, under laboratory conditions, but typically on railways it is between 0.35 and 0.5, [ 4 ] whilst under ...

  6. 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.

  7. 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]

  8. Coulomb damping - Wikipedia

    en.wikipedia.org/wiki/Coulomb_damping

    Coulomb damping dissipates energy constantly because of sliding friction. The magnitude of sliding friction is a constant value; independent of surface area, displacement or position, and velocity. The system undergoing Coulomb damping is periodic or oscillating and restrained by the sliding friction.

  9. Stick–slip phenomenon - Wikipedia

    en.wikipedia.org/wiki/Stick–slip_phenomenon

    The load then starts sliding, and the friction coefficient decreases to the value corresponding to load times the dynamic friction. Since this frictional force will be lower than the static value, the load accelerates until the decompressing spring can no longer generate enough force to overcome dynamic friction, and the load stops moving.