Switch-over Pendulum
In the centre of this pendulum rod is a large disc that can rotate freely. Large extended bodies perform a rotational movement in the pendulum and behave differently than usual (mathematical) pendulums due to the high mass inertia - they are therefore also called "physical pendulums".
Here you can switch between these two pendulums: Since the disc can rotate freely, it does not go along with the turning movement, the entire mass behaves like a mass point on the rod.
However, if you block the disc, it has to follow the turning movement - this has an effect on the pendulum movement...
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