An investigation of the driven harmonic oscillator, showing the measured oscillator amplitude as a function of drive frequency.  These data were taken by hand in about 15 minutes, observing the length of the laser streak on the graduated ruler. The fit curve is a Lorentzian, which is a reasonable approximation of the theoretical response function of a Simple Harmonic Oscillator. Residuals show the data minus the fit curve, scaled to give the residuals in percent of the measured amplitude.

Harmonic Oscillator