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# Answer to Question #4574 in Mechanics | Relativity for anil

Question #4574
How is the equation of simple harmonic motion y=a sinwt derived and what is the physical meaning of phase
1
2011-10-11T12:17:35-0400
Let&#039;s derive the equation of simple harmonic motion by t:
y&#039; = aw cos(wt).

The phase of an oscillation or wave is the fraction of a complete cycle corresponding to an offset in the displacement from a specified reference point at time t = 0. Phase is a frequency domain or Fourier transform domain concept, and as such, can be readily understood in terms of simple harmonic motion. The same concept applies to wave motion, viewed either at a point in space over an interval of time or across an interval of space at a moment in time. Simple harmonic motion is a displacement that varies cyclically, as depicted to the right.
It is described by the formula:

x(t) = A sin(2pi*ft+&theta;)

where A is the amplitude of oscillation, f is the frequency, t is the elapsed time, and &theta; is the phase of the oscillation. The phase determines or is determined by the initial displacement at time t = 0. A motion with frequency f has period T = 1/f.

& an interval of space at a moment in time. Simple harmonic motion is a displacement that varies cyclically, as depicted to the right.

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