Phase

phase φ : state of the motion after last passing through the  central position  (in positive direction)

φ = t/T  

This formula as at t = 0 s  the phase= 0 is. This means at t = 0 s the body is moving in a positive direction through the central position.

Example

A body is in simple harmonic motion.  f = 5.0 Hz .

At  t=0 s the body moves trough the central position in positive direction    ( φ (0) = 0 )

At  t = 0.34 s  :   φ = 0.34/0.20 = 1.7 = 0.7

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