- four-acceleration
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four-acceleration
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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-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
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
Four-stroke engine — Four stroke cycle used in gasoline/petrol engines. The right blue side is the intake and the left yellow side is the exhaust. The cylinder wall is a thin sleeve surrounded by cooling liquid. A video montage of the Otto engines running at the… … Wikipedia
Four-cross — (4X), also called Mountain cross, not to be confused with Fourcross, is a relatively new style of mountain bike racing where four bikers race downhill on a prepared, BMX like, track, simply trying to get down first. These bikes are generally… … Wikipedia
acceleration stress — ▪ physiology Introduction physiological changes that occur in the human body in motion as a result of rapid increase of speed. Rapid acceleration and surges in acceleration are felt more critically than are gradual shifts. Pilots are… … Universalium
Proper acceleration — [Edwin F. Taylor John Archibald Wheeler (1966 1st ed. only) Spacetime Physics (W.H. Freeman, San Francisco) ISBN 0 7167 0336 X] is the physical acceleration experienced by an object. It equals the rate of change of proper velocity with respect to … Wikipedia
Quattro (four wheel drive system) — quattro (meaning four in Italian), is the name used by Audi AG to indicate that four wheel drive (4WD) technologies or systems are used on specific models of the Audi automobiles.Audi.com Glossary [http://www.audi.com/audi/com/en2/tools/glossary/e… … Wikipedia
