The guitar string is an example of simple harmonic motion, or SHM. ... If the displacement of the mass is plotted as a function of time, it will trace out a sinusoidal wave.

The displacement d, whose maximum is the AMPLITUDE A, may be expressed as: d = A sin q = A sin wt = A sin (2pft) Geometric derivation of simple harmonic motion. A point p moves at constant speed on ...