I conducted an experiment in my youth, creating a 'sand pendulum' hanging from the bedroom ceiling to a bowl of flour. I did not set the pendulum into motion, but rather wanted to see if the force of gravity was constant or shifted over time. I don't recall if I checked within or after 24 hours. However, when I checked, I found my pendulum had traced a small circle in the flour.
I cannot find any information on whether this experiment (involving a non-swinging sand pendulum) had been conducted previously and how it may relate to the known physics of pendulums and Earth's rotation.
Please let me know, Conor H. Murray, PhD (neurobiologist)