25.6.4 Finding the Equation from the Graph
Core ideaRead a known wave in reverse — measure its height, its tightness, and its starting point — and you can work back to A, ω, and φ.
Module goal. We treat a sine wave's amplitude, period, and phase as adjustable dials, understand how each parameter reshapes the graph, and use it to describe real back-and-forth motions like springs and sound.