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IEVref: | 113-03-13 | ID: | |

Language: | en | Status: Standard | |

Term: | momentum | ||

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Symbol: | p | ||

Definition: | vector quantity equal to the product of the mass m of a body and the velocity of its centre of mass, thus v = pmvNOTE 1 For a continuous body in a domain D, momentum is equal to the integral $p={\displaystyle {\int}_{\text{D}}\rho}\text{\hspace{0.17em}}vdV={\displaystyle {\int}_{\text{D}}vdm}$, where NOTE 2 If the sum of external forces is equal to zero, momentum of a body follows a law of conservation. NOTE 3 If the theory of relativity is applied, NOTE 4 The coherent SI unit of momentum is kilogram metre per second, kg·m·s | ||

Publication date: | 2011-04 | ||

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Internal notes: | 2014-07-07: Symbol <i>p</i> corrected to <b><i>p</i></b>. JGO 2017-06-02: Cleanup - Remove Attached Image 113-03-13en.gif | ||

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NOTE 1 For a continuous body in a domain D, momentum is equal to the integral $p={\displaystyle {\int}_{\text{D}}\rho}\text{\hspace{0.17em}}vdV={\displaystyle {\int}_{\text{D}}vdm}$, where *ρ* is the mass density in a domain having quasi-infinitesimal volume d*V* and mass d*m*, and velocity ** v**. For a system of bodies, it is equal to the sum of their momentums.

NOTE 2 If the sum of external forces is equal to zero, momentum of a body follows a law of conservation.

NOTE 3 If the theory of relativity is applied, *m* is relativistic mass.

NOTE 4 The coherent SI unit of momentum is kilogram metre per second, kg·m·s^{−1}.