Momentum Wikipedia. This article is about linear momentum. It is not to be confused with angular momentum. In Newtonian mechanics, linear momentum, translational momentum, or simply momentum pl. It is a three dimensional vector quantity, possessing a direction and a magnitude. If m is an objects mass and v is the velocity also a vector, then the momentum ispmv,displaystyle mathbf p mmathbf v ,In SI units, it is measured in kilogram meters per second kg ms. Newtons second law of motion states that a bodys rate of change in momentum is equal to the net force acting on it. Momentum depends on the frame of reference, but in all frames, it is a conserved quantity, meaning that if a closed system is not affected by external forces, its total linear momentum cannot change. Momentum is also conserved in special relativity with a modified formula and, in a modified form, in electrodynamics, quantum mechanics, quantum field theory, and general relativity. It is an expression of one of the fundamental symmetries of space and time, that of translational symmetry. Advanced formulations of classical mechanics, Lagrangian and Hamiltonian mechanics, allow one to choose coordinate systems that incorporate symmetries and constraints. In these systems the conserved quantity is generalized momentum, and in general this is different from the kinetic momentum defined above.
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