In classical mechanics, linear momentum or translational momentum (pl. momenta; SI unit kg m/s, or, equivalently, N s) is the product of the mass and velocity of an object. For example, a heavy truck moving fast has a large momentum—it takes a large and prolonged force to get the truck up to this speed, and it takes a large and prolonged force to bring it to a stop afterwards. If the truck were lighter, or moving slower, then it would have less momentum.
Like velocity, linear momentum is a vector quantity, possessing a direction as well as a magnitude:
Linear momentum is also a conserved quantity, meaning that if a closed system is not affected by external forces, its total linear momentum cannot change. In classical mechanics, conservation of linear momentum is implied by Newton's laws; but it also holds in special relativity (with a modified formula) and, with appropriate definitions, a (generalized) linear momentum conservation law holds in electrodynamics, quantum mechanics, quantum field theory, and general relativity.
Other articles related to "kinetic momentum, momentum, kinetic":
... The kinetic momentum p is different to the canonical momentum P (synonymous with the generalized momentum) conjugate to the ordinary position coordinates r, because P includes a contribution ... See also Electromagnetism (momentum) ... for a particle in any field equals the total energy of the system - the kinetic energy T = p2/2m (where p2 = p·p, see dot product) plus the potential energy V ...
... working in Alexandria, Byzantine philosopher John Philoponus developed a concept of momentum in his commentary to Aristotle's Physics ... This should not be read as a statement of the modern law of momentum, since he had no concept of mass as distinct from weight and size, and more importantly he believed that it is speed rather than ... The first correct statement of the law of conservation of momentum was by English mathematician John Wallis in his 1670 work, Mechanica sive De Motu ...
... for the enhanced mixing and increased rates of mass, momentum and energy transports in a flow is called "diffusivity" ... the component of vorticity in the stretching direction—due to the conservation of angular momentum ... scale structures are small enough to the extent where their kinetic energy is overwhelmed by the fluid's molecular viscosity and dissipated into heat ...
Famous quotes containing the word kinetic:
“All my stories are webs of style and none seems at first blush to contain much kinetic matter.... For me style is matter.”
—Vladimir Nabokov (18991977)