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In Newtonian mechanics, momentum (pl.: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.
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Idealized 3-D rendering of the cradle in motion. Newton's cradle is a device, usually made of metal, that demonstrates the principles of conservation of momentum and conservation of energy in physics with swinging spheres.
The moment of force, or torque, is a first moment: =, or, more generally, .; Similarly, angular momentum is the 1st moment of momentum: =.Momentum itself is not a moment.; The electric dipole moment is also a 1st moment: = for two opposite point charges or () for a distributed charge with charge density ().
CK-12 Flexbooks are the open textbooks designed for United States K-12 courses. [49] CK-12 FlexBooks are designed to facilitate conformance to national and United States and individual state textbook standards. CK-12 FlexBooks are licensed under a Creative Commons BY-NC-SA license. CK-12 FlexBooks are free to use online and offer formats ...
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These certifications can overlap. In Missouri, for example, middle school certification covers grades 6–8, elementary school certification covers kindergarten to grade 5, and high school certification covers grades 9–12. This reflects the wide range of grade combinations of middle schools, junior high schools, and elementary schools.
In relativity, the COM frame exists for an isolated massive system.This is a consequence of Noether's theorem.In the COM frame the total energy of the system is the rest energy, and this quantity (when divided by the factor c 2, where c is the speed of light) gives the invariant mass of the system: