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Gravitation field strength
The gravitational field strength ($g$) at a point is defined as the force per unit mass experienced by a small test mass placed at that point.
Gravitational potential
Gravitational potential ($V_g$) is the work done per unit mass to bring a small test mass from infinity to a point in a gravitational field.
Gravitational potential energy
Gravitational potential energy is the energy stored due to the position of an object in a gravitational field.