Demonstration Experiment Using a Dissectable Anharmonic Oscillator

The concept of perturbations is introduced to the general physics student using a forced anharmonic oscillator constructed on a linear air track. The interaction between a bar magnet mounted atop the glider and two U magnets supplies the perturbation. The general characteristics of the system are described, and plots of the amplitude versus driving frequency showing a “jump” effect are presented. The advantage of the system described is that all components of the system are open to study by the student.