An intuitive introduction to oscillation — what makes motion 'simple', what makes it 'harmonic', and why it is everywhere in physics.
How x, v, and a vary with time — and the phase relationships between them.
Kinetic and potential energy in SHM — their exchange, their sum, and why total energy depends only on amplitude.
How spring constant k and mass m determine the time period — and what changes when springs are combined.
What the phase constant means physically, how initial position and velocity determine it, and how to read phase from a graph.
The three ways to measure how fast an oscillator oscillates — and the exact relationships between them.
How gravity shifts the equilibrium position — and why the SHM physics is unchanged.
SHM approximation for small angles — why a pendulum swings isochronously and how length determines period.
Clean exam-style snapshots of key SHM moments — for quick revision and problem solving.