A Froude pendulum is a simple pendulum suspended in a rotating shaft (taken from:
VIBRATION OF EXTERNALLY-FORCED FROUDE PENDULUM, International Journal of Bifurcation and Chaos, Vol. 9, No. 3 (1999) 561-570)
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The longer the length of the pendulum, the longer the time taken for the pendulum to complete 1 oscillation.
A longer pendulum will have a smaller frequency than a shorter pendulum.
The period of a pendulum is affected by the angle created by the swing of the pendulum, the length of the attachment to the mass, and the weight of the mass on the end of the pendulum.
A simple pendulum has one piece that swings. A complex pendulum has at least two swinging parts, attached end to end. A simple pendulum is extremely predictable, while a complex pendulum is virtually impossible to accurately predict.