The first premise to understand is that simple harmonic motion through time generates sinusoidal motion.

The following diagram will display the amplitude of the harmonic motion and for this we need to use the term *A* in our formula. We will also be using θ.

I have used the equation *A* sin θ where θ completes one cycle (degrees).

The *y *axis displays values based on a unit circle with *A *being interpreted as amplitude.

The *x* axis denotes degrees (θ)

When dealing with events, as we do for cycles as an example, we are concerned with two factors: Frequency (f) and Time (T). If we look at a single event then T is defined as the start to end of that event and that amount is measured as a Period.

When dealing with a waveform cycle, the time it takes for the cycle to return to its starting position is defined as Periodicity. Taking this a step further, Frequency is then defined as the number of events that occur over a specified time, and this is illustrated with the following equation: