But on the other hand, if for the convenience of the problem, t = 0 has to be considered at a point when the particle at an extreme position, then ф would be ±п/2 depending on the direction of velocity of the particle at that position.Īngular frequency (ω) To understand angular frequency, we first try to understand frequency of simple harmonic motion. If we choose to call the instant when the particle is passing through its mean position as the time t = 0, then ф = 0 as at that time x has to be zero. ![]() To describe the motion quantitatively, a particular instant should be called zero and measurement of time should be made from this instant. It depends on the choice of the instant t = 0. Phase Angle (ф) The time varying quantity (ωt +ф) is called the phase of the motion and the quantity ф is called the phase angle or phase constant. It is the maximum displacement of the particle from the center of oscillation i.e. This gives the physical significance of the constant A. As sin(ωt +ф) can take values between -1 and +1, the displacement x can take values between –A and +A. Amplitude The quantity A is called the amplitude of the motion.
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