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Field
A region of space where an object experiences a force because of the presence of another object (for example, a magnet or an electric charge).
Freefall
Freefall occurs when gravity is the only force acting on an object.
Gravitational field strength (g)
The gravitational force per unit mass at a point in a gravitational field and is measured in $\text{N kg}^{-1}$.
Gravity
Gravity is the interaction that makes objects fall, gives us a sense of "up" and "down," and keeps moons, planets, and galaxies in orbit.
Mass
The amount of material in a body or object.
Orbit
An orbit is a curved path followed by an object moving under the influence of gravity.
Satellite
A natural object that orbits a larger body due to gravity, such as the Moon orbiting Earth.
Weight
The gravitational force acting on an object due to a gravitational field.