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  2. Sliding (motion) - Wikipedia

    en.wikipedia.org/wiki/Sliding_(motion)

    Sliding friction (also called kinetic friction) is a contact force that resists the sliding motion of two objects or an object and a surface. Sliding friction is almost always less than that of static friction; this is why it is easier to move an object once it starts moving rather than to get the object to begin moving from a rest position.

  3. Playground slide - Wikipedia

    en.wikipedia.org/wiki/Playground_slide

    A roller slide is a slide made of horizontal cylinders which spin underneath the person sliding as they travel down. Amusement-park slides are just larger versions of the playground slide, much higher and with multiple parallel slideways. Participants may be provided with a sack to sit on to reduce friction for higher speeds and to protect ...

  4. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    Kinetic friction, also known as dynamic friction or sliding friction, occurs when two objects are moving relative to each other and rub together (like a sled on the ground). The coefficient of kinetic friction is typically denoted as μ k , and is usually less than the coefficient of static friction for the same materials.

  5. Rolling contact fatigue - Wikipedia

    en.wikipedia.org/wiki/Rolling_contact_fatigue

    rolling friction. In the case of bodies capable of rolling, there is a particular type of friction, in which the sliding phenomenon, typical of dynamic friction, does not occur, but there is also a force that opposes the motion, which also excludes the case of static friction. This type of friction is called rolling friction.

  6. Frictional contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Frictional_contact_mechanics

    Friction – Force resisting sliding motion; Friction drive – Mechanical power transmission by friction between components; Lubrication – The presence of a material to reduce friction between two surfaces. Metallurgy – Field of science that studies the physical and chemical behavior of metals

  7. Friction Acoustics - Wikipedia

    en.wikipedia.org/wiki/Friction_Acoustics

    Vibrational energy induced by either kinetic or breakaway friction can cause modal excitation of a subset of the contacting bodies or the vibratory coupling of the multiple bodies, depending on the strength of coupling. Friction noise can be the product of multiple distinct dynamic processes, sliding and stick-slip. Sliding generally leads to ...

  8. Rotating locomotion in living systems - Wikipedia

    en.wikipedia.org/wiki/Rotating_locomotion_in...

    A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of certain flagella, which work like corkscrews).

  9. Simple machine - Wikipedia

    en.wikipedia.org/wiki/Simple_machine

    Simple machines are elementary examples of kinematic chains that are used to model mechanical systems ranging from the steam engine to robot manipulators. The bearings that form the fulcrum of a lever and that allow the wheel and axle and pulleys to rotate are examples of a kinematic pair called a hinged joint. Similarly, the flat surface of an ...