Simple Pendulum and mass-on-spring - change gravity and other variables to see effect on period of oscillation. Good alternative to "real" experiment. Subscription required but with 30 day free trial.
One of the most common representations of dynamic coupling between two variables x and y is the "lead-lag" transfer function, which is based on the ordinary first-order differential equation
The nature and properties of waves are discussed and illustrated with the standing wave being introduced and explained. Clear explanation and appropriate graphics.
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