The motion is periodic, repeating itself in a sinusoidal fashion with constant amplitude "A". In addition to its amplitude, the motion of a simple harmonic oscillator is characterized by its period formula_5, the time for a single oscillation or its frequency formula_6, the number of cycles per unit time. The position at a given time "t" also depends on the phase "φ", which determines the starting point on the sine wave. The period and frequency are determined by the size of the mass "m" and the force constant "k", while the amplitude and phase are determined by the starting position and velocity.