# Moment (physics)

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In physics, a moment is an expression involving the product of a distance and another physical quantity, and in this way it accounts for how the physical quantity is located or arranged.wikipedia
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### Torque

moment armmomentlever arm
For example, the moment of force acting on an object, often called torque, is the product of the force and the distance to the object from the reference point.
When being referred to as moment of force, it is commonly denoted by M.

### Angular momentum

conservation of angular momentumangular momentamomentum
It has the effect of multiplying the momentum's effort in proportion to its length, an effect known as a moment. Hence, the particle's momentum referred to a particular point,

### Moment (mathematics)

momentsmomentraw moment
The concept of moment in physics is derived from the mathematical concept of moments.
The mathematical concept is closely related to the concept of moment in physics.

### Moment of inertia

rotational inertiamoments of inertiamoment of inertia tensor
Specifically, it is the second moment of mass with respect to the orthogonal distance from an axis (or pole).

### Polar moment of inertia

moment of inertiapolar moments of inertiapolar-moment
Where the planar second moment of area describes an object's resistance to deflection (bending) when subjected to a force applied to a plane parallel to the central axis, the polar second moment of area describes an object's resistance to deflection when subjected to a moment applied in a plane perpendicular to the object's central axis (i.e. parallel to the cross-section).

### Second moment of area

area moment of inertiaMoment of Inertiasecond moments of area
In structural engineering, the second moment of area of a beam is an important property used in the calculation of the beam's deflection and the calculation of stress caused by a moment applied to the beam.

### Couple (mechanics)

couplerocking coupleforce couple

### Magnetic moment

magnetic dipole momentmagnetic momentsdipole moment

### Physics

physicistphysicalphysicists
In physics, a moment is an expression involving the product of a distance and another physical quantity, and in this way it accounts for how the physical quantity is located or arranged.

The 0th moment (n = 0) is sometimes called the monopole moment; the 1st moment (n = 1) is sometimes called the dipole moment, and the 2nd moment (n = 2) is sometimes called the quadrupole moment, especially in the context of electric charge distributions.

### Momentum

conservation of momentumlinear momentummomenta

### Electric dipole moment

electric dipoledipole momentdipole

### Mass

inertial massgravitational massweight

### Center of mass

center of gravitycentre of gravitycentre of mass

### Scalar potential

potentialpotential functionpotential field
Assuming a density function that is finite and localized to a particular region, outside that region a 1/r potential may be expressed as a series of spherical harmonics:

### Spherical harmonics

spherical harmonicspherical functionsLaplace series
Assuming a density function that is finite and localized to a particular region, outside that region a 1/r potential may be expressed as a series of spherical harmonics:

### Multipole expansion

multipolemultipole momentsmultipole moment
treatment may be found in pages describing multipole expansion or

### Spherical multipole moments

spherical harmonic addition theoremspherical multipole moment
spherical multipole moments.

### Electric potential

electrical potentialelectrostatic potentialCoulomb potential
The multipole expansion applies to 1/r scalar potentials, examples of which include the electric potential and the gravitational potential.

### Gravitational potential

gravity potentialgravitational potential energygravitational
The multipole expansion applies to 1/r scalar potentials, examples of which include the electric potential and the gravitational potential.

### Wilkinson Microwave Anisotropy Probe

WMAPWilkinson Microwave Anisotropy Probe (WMAP)WMAP satellite
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.

### Planck (spacecraft)

PlanckPlanck spacecraftPlanck satellite
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.