When two or more waves arrive at the same point, they superimpose themselves on one another. More specifically, the disturbances of waves are superimposed when they come togethera phenomenon called superposition. Each disturbance corresponds to a force, and forces add. If the disturbances are along the same line, then the resulting wave is a simple addition of the disturbances of the individual wavesthat is, their amplitudes add. Figure 16.33 and Figure 16.34 illustrate superposition in two special cases, both of which produce simple results