**Momentum**

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.

Read more about Momentum: Newtonian Mechanics, Generalized Coordinates, Classical Electromagnetism, Quantum Mechanics, History of The Concept

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**Momentum**- History of The Concept

... 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 ... 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, Tractatus ...

... It is closely related to the Navier–Stokes equations, because the flow of

**momentum**in a fluid is mathematically similar to the flow of mass or energy ... of an incompressible Newtonian fluid, in which case the Navier–Stokes equation is where M is the

**momentum**of the fluid (per unit volume) at each point (equal to the density multiplied by the velocity ... on the left-hand side describes the change in

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