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Force field definition

Informally, a force field is a region of space in which a non-contact force acts on a body.

This means that an object in a force field experiences a force without physical contact with other objects.

The gravitational field around a planet exerts a force on a satellite orbiting the planet. The gravitational field is a force field.

The idea of fields is explicit in the alignment of iron fillings by a magnetic field.

The two poles of the magnet create a magnetic field that exerts a force on each small piece of iron around it. The iron fillings trace the form of the magnetic field.
The two poles of the magnet create a magnetic field that exerts a force on each small piece of iron around it. The iron fillings trace the form of the magnetic field.

The non-contact force varies in magnitude according to the physical properties (e.g. mass, charge, velocity) of the object and the position of the object.

The magnitude of the field at a point in space is known as the field strength. The potential energy of the object at a point in space due to a particular field depends on the field strength at that same point.