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Re: Midterm Question - Sort of



You could describe a push at a subharmonic as a Fourier series
which has a component with which the swing is in resonance. I
don't know if this can be called anything but a linear response,
however.

If one analyzes the pumping of a swing (which occurs at *twice*
the pendulum frequency) it can be looked upon as parametric
excitation.

Leigh