How do I know that equation is good to use? Simple - it agrees with experimental evidence. So, for the rest of this post, I am going to use that equation of motion as though it were a real pendulum.

Run the pendulum model for a much longer time than just 10 seconds (easy to change in the code above). You might find that the mass on the string starts to misbehave in certain ways. See if you ...

But Dr. Karan Rajan, who’s known for spreading his medical know-how on TikTok, recently shared something called “the pendulum method” which may help you, too. It’s not to do with the muscles you use ...