Free particle

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In physics, objects (e.g. charge carriers ) that are not in a potential are referred to as free particles . Thus no force acts on the particle and one only has to work against its inertia in order to change its speed ; the speed remains constant when no work is done. Since the potentials usually reach infinitely far, in most cases they are approximations. In cases where this approximation is only marginally sufficient, one also speaks of quasi-free particles.

The opposite of a free particle is the bound state .