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Stiction (a portmanteau of the words static and friction) [1] is the force that needs to be overcome to enable relative motion of stationary objects in contact. [2] Any solid objects pressing against each other (but not sliding) will require some threshold of force parallel to the surface of contact in order to overcome static adhesion. [3]
The English equivalent "living force" was also used, for example by George William Hill. [ 3 ] The term is due to the German philosopher Gottfried Wilhelm Leibniz , who was the first to attempt a mathematical formulation from 1676 to 1689.
Hertz's principle of least curvature is a special case of Gauss's principle, restricted by the three conditions that there are no externally applied forces, no interactions (which can usually be expressed as a potential energy), and all masses are equal. Without loss of generality, the masses may be set equal to one.
Consider a bar of original cross sectional area A 0 being subjected to equal and opposite forces F pulling at the ends so the bar is under tension. The material is experiencing a stress defined to be the ratio of the force to the cross sectional area of the bar, as well as an axial elongation:
The SI unit of force is the newton (symbol N), which is the force required to accelerate a one kilogram mass at a rate of one meter per second squared, or kg·m·s −2.The corresponding CGS unit is the dyne, the force required to accelerate a one gram mass by one centimeter per second squared, or g·cm·s −2. A newton is thus equal to ...
This season, the flu has already claimed the lives of roughly 1,500 people across the country, including nine children. Five youngsters’ deaths were recorded between Dec. 15 and Dec. 21.
The Los Angeles Chargers are signing running back Ezekiel Elliott, according to multiple reports.. NFL Media was the first to report the deal.. The 29-year-old Elliott was released by the Dallas ...
The revelation came from a task force report that probed security failures at the July 13 campaign rally in Butler, Pa. where President-elect Donald Trump nearly lost his life to an assassin's bullet.