Free particle

As a free particles, objects ( eg, charge carriers) referred to physics, are not located in a potential. Thus, no force acts on the particle and you just have to make against its inertia work to change its velocity, or the speed remains constant when no work is expended. Since the potentials infinitely far into the rule, it is in most cases in order approximations. In cases where this approximation are permitted, also referred to as quasi-free particles.

The opposite of a free particle is the bound state.

Examples

• A rocket away from all planets ( gravitational potential )
• An electron far away from other charges ( Coulomb potential )
• The Drude theory for the description of the electrons in the electron metals treated as free particles (except for the additional assumption that the electrons do not leave the metal).
• A free neutron is a neutron outside of atomic nuclei ( strong interactions )

• Particle Physics