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Moon Bin Supporting Cast. Cast - Moment of Eighteen. Kang Ki Young Supporting Cast. Jung Young Joo Supporting Cast. Han Sung Min Supporting Cast. Eighteen Staff. In principle, any physical quantity can be multiplied by a distance to produce a moment; commonly used quantities include forces, masses, and electric charge distributions. In its most simple and basic form, a moment is the product of the distance to some point, raised to some power, and some physical quantity such as the force, charge, etc.
If the quantity is not concentrated solely at a single point, the moment is the integral of that quantity's density over space:.
A more complete treatment may be found in pages describing multipole expansion or spherical multipole moments. Note: the convention in the above equations was taken from Jackson. For these potentials, the expression can be used to approximate the strength of a field produced by a localized distribution of charges or mass by calculating the first few moments.
For sufficiently large r , a reasonable approximation can be obtained from just the monopole and dipole moments. Higher fidelity can be achieved by calculating higher order moments. Extensions of the technique can be used to calculate interaction energies and intermolecular forces.
Measurements pertaining to multipole moments may be taken and used to infer properties of the underlying distribution. This technique applies to small objects such as molecules,   but has also been applied to the universe itself,  being for example the technique employed by the WMAP and Planck experiments to analyze the cosmic microwave background radiation. The concept of moment in physics is derived from the mathematical concept of moments.
In the lever one applies a force, in his day most often human muscle, to an arm, a beam of some sort. However, historical evolution of the term 'moment' and its use in different branches of science, such as mathematics, physics and engineering, is unclear. Federico Commandino , in , translated into Latin from Archimedes :. This was apparently the first use of the word moment Latin, momentorum in the sense which we now know it: a moment about a center of rotation.
From Wikipedia, the free encyclopedia. Not to be confused with Momentum. For the mathematical concept, see Moment mathematics.
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For the moment of a force, sometimes shortened to "moment", see Torque.