The question pendulum modeling is essentially a duplicate of the question mathematical model of a pendulum. I had supplied an answer to the older one and wanted to find it. I searched on my user number plus pendulum (
user:1827 pendulum), but it did not find my answer. I suspect it was because I did not use the word pendulum in my answer, it was only in the question.
The search function needs to be broader about where it looks for the terms searched for.