Physics D.1 Gravitational Fields

Gravitational field strength

Gravitational field strength is the force per unit mass experienced by a small test mass placed at a point in a gravitational field. It is given by g = \frac{GM}{r^2}.

Kepler’s laws of orbital motion

Kepler’s laws describe how planets orbit the Sun: (1) elliptical orbits, (2) equal areas in equal time, (3) T^2 ∝ r^3.

Newton’s universal law of gravitation

The force between two masses is given by F = \frac{G m1 m2}{r^2}.

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