JAMB Physics 2021 Paper

Concept:Simple harmonic motion (SHM) is oscillatory motion in which acceleration is directed toward the equilibrium point and proportional to displacement from it.Explanation:In SHM, the body moves to and fro about a fixed mean position.The acceleration always points back toward this fixed point.If $x$ is the displacement, then $a \propto -x$, or $a = -\omega^2 x$.So acceleration is not constant and is not proportional to the square of the distance.A straight-line path alone does not guarantee SHM.Among the options, the correct condition is that the acceleration is always directed towards a fixed point.Answer:A. acceleration is always directed towards a fixed point.