similar to the electric radiation reaction force, three conditions must be met in order to derive the following formula for the magnetic radiation reaction force. first, the motion of the magnetic moment must be periodic, an assumption used to derive the force. second, the magnetic moment is traveling at non-relativistic velocities (that is, much slower than the speed of light). finally, this only applies this force is proportional to the fifth derivative of the position as a function of time (sometimes somewhat facetiously referred to as the "crackle"). unlike the abraham–lorentz force, the force points in the direction opposite of the "crackle".