This article summarizes equations in the theory of gravitation.
Definitions
Gravitational mass and inertia
A common misconception occurs between centre of mass and centre of gravity.
They are defined in similar ways but are not exactly the same quantity.
Centre of mass is the mathematical description of placing all the mass in the region considered to one position, centre of gravity is a real physical quantity, the point of a body where the gravitational force acts.
They are equal if and only if the external gravitational field is uniform.
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Newtonian gravitation
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Gravitoelectromagnetism
In the weak-field and slow motion limit of general relativity, the phenomenon of gravitoelectromagnetism (in short "GEM") occurs, creating a parallel between gravitation and electromagnetism.
The gravitational field is the analogue of the electric field, while the gravitomagnetic field, which results from circulations of masses due to their angular momentum, is the analogue of the magnetic field.
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Equations
Newtonian gravitational fields
It can be shown that a uniform spherically symmetric mass distribution generates an equivalent gravitational field to a point mass, so all formulae for point masses apply to bodies which can be modelled in this way.
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Gravitational potentials
General classical equations.
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Weak-field relativistic equations
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See also
Defining equation (physical chemistry)
Defining equation (physics)
List of electromagnetism equations
List of equations in classical mechanics
List of equations in nuclear and particle physics
List of equations in quantum mechanics
List of equations in wave theory
List of photonics equations
List of relativistic equations
Table of thermodynamic equations
Footnotes
Sources
Further reading
