Inertia wheel pendulum
Encyclopedia
An inertia wheel pendulum or gyroscopic pendulum is a pendulum
Pendulum
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position...

 with an inertia wheel attached. It can be used as a pedagogical problem in control theory
Control theory
Control theory is an interdisciplinary branch of engineering and mathematics that deals with the behavior of dynamical systems. The desired output of a system is called the reference...

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