Vibrations: sound begins with vibrations, a vibration is a motion that is back and forth, a path traditional science is to first consider the simplest possible system and describe it as completely as possible. 1. this vibration is called simple harmonic motion. Definitions the most fundamental mechanical vibrator is a single mass hanging from a spring if there is no motion, then the mass is at rest and is said to be in equilibrium. Motion is repeated indefinitely the basic pattern that recurs is a cycle the duration of a cycle is a period. Making the spring stiffer will make the motion faster and decrease the period. Making the mass heavier will make the motion slower and increase the period. Mathematically, simple harmonic motion is described by the sine function of trigonometry called sine wave motion equation: When two sine waves have the same frequency but different starting phases, one is said to lead or to lag the other.
