Simple Harmonic Motion & Waves intro — three ways to learn it.

The complete written lesson — what makes motion simple harmonic (a ∝ −x), the equations of SHM, the simple pendulum and the find-g practical, the mass–spring system with Hooke's law, energy interchange, and free/forced oscillations with resonance.

As you scroll, a live 3D panel animates every idea: pull the pendulum bob aside and time its swing, then hang a mass on the spring and watch Hooke's law drive the oscillation — the two board experiments, alive on screen.

Run the simple-pendulum find-g experiment and the Hooke's-law spring experiment on a safe, virtual bench. All of the course's hands-on physics apparatus lives here.