Gravitational fields

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General stuff:

Fields: A field is a region in space where forces are exerted on objects with certain properties.

Gravity is a vector field.

A uniform field has the same magnitude and direction everywhere in the field. (e.g., the surface of the Earth)

A radial field has varying magnitude and the direction is always to the centre of the object. The magnitude decreases as the distance from the object increases. (The Earth)

Properties of a gravitational field:

Direction: the direction of the force felt by a test mass placed in the field.
Magnitude: The force per unit mass.

Gravitational field strength: g = F/m (units N/Kg)

Newton's law of gravitation:

The force of attraction


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