Learn Euler's Method for Pendulum Simulation | Excel Tutorial

[max1992]

This is not part of my homework, but it can make my life much easier. I try to prepare the Excel file as instructed in the link, but I can not find information on how to get the correct value of Theta Dot.

http://www.esm.psu.edu/courses/emch12/IntDyn/course-docs/Euler-tutorial/

I'm sorry that I ask the question, but I do not have classes in physics, and one of my teachers requires us to prepare a program imitating a pendulum. This excel I would like to be treated as a base, which later I move to the code.

My question: What formula I should try to generate value assigned to a cell Theta Dot? I can not find it in the link, which I have enclosed.

Thanks in advance!

 

[Chestermiller]

According to Euler's method,
$$\dot{\theta}_{(t+\Delta t)}=\dot{\theta}_{t}+\ddot{\theta}_t\Delta t$$