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History Graphs

The history graph of an oscillation shows its displacement $y(t)$ on the vertical axis, versus the time on the horizontal axis.

• The amplitude of the oscillation is the vertical distance from the center line to the crest. It has the same units as displacement.
• The period of the oscillation is the distance between two consecutive crests. It has units of seconds.
• The frequency of the oscillation can be found by measuring the period first, and finding the reciprocal.