17.1.5—Graphical representations of the variations of displacement, velocity and

For sinusoidal SHM, velocity is 90° out of phase with displacement and acceleration is 180° out of phase with displacement.

At equilibrium displacement is zero while speed is maximum; at extremes speed is zero while acceleration points back toward equilibrium.

A displacement sine graph has a velocity cosine graph and an acceleration graph inverted relative to displacement.

The graphs do not all peak at the same time; phase relationships encode the restoring motion.