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Four-force — In the special theory of relativity four force is a four vector that replaces the classical force; the four force is the four vector defined as the change in four momentum over the particle s own time::mathbf{F} = {dmathbf{P} over d au}.For a… … Wikipedia
Force Acts — can refer to several groups of acts passed by the United States Congress. The term usually refers to the events after the American Civil War.Jefferson s EmbargoThe first time a force act was used was in 1807, when Congress forced Jefferson s… … Wikipedia
Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate … Wikipedia
Four-acceleration — In special relativity, four acceleration is a four vector and is defined as the change in four velocity over the particle s proper time:: mathbf{A} =frac{dmathbf{U{d au}=left(gamma udotgamma u c,gamma u^2mathbf a+gamma udotgamma umathbf u… … Wikipedia
Four-vector — In relativity, a four vector is a vector in a four dimensional real vector space, called Minkowski space. It differs from a vector in that it can be transformed by Lorentz transformations. The usage of the four vector name tacitly assumes that… … Wikipedia
Four-momentum — In special relativity, four momentum is the generalization of the classical three dimensional momentum to four dimensional spacetime. Momentum is a vector in three dimensions; similarly four momentum is a four vector in spacetime. The… … Wikipedia
Four-velocity — In physics, in particular in special relativity and general relativity, the four velocity of an object is a four vector (vector in four dimensional spacetime) that replaces classical velocity (a three dimensional vector). It is chosen in such a… … Wikipedia
Force concentration — is the practice of concentrating a military force, so as to bring to bear such overwhelming force against a portion of an enemy force that the disparity between the two forces alone acts as a force multiplier, in favour of the concentrated forces … Wikipedia
Four Lakes, Washington — Four Lakes is a small unincorporated community in Spokane County, Washington, United States, just southwest of the city of Spokane, and north of Cheney. Both Interstate 90 and SR 904 run through Four Lakes and the junction of the two is located… … Wikipedia
four — [ fur ] n. m. • forn 1080; lat. furnus 1 ♦ Ouvrage de maçonnerie généralement voûté, de forme circulaire, muni d une ouverture par devant, et où l on fait cuire le pain, la pâtisserie, etc. Four de boulanger. Four à pizza. Bouche, gueule d un… … Encyclopédie Universelle
