>>626583
I just followed this tutorial to make my first diagram in inkscape https://www.youtube.com/watch?v=8TMICjVvALc
Soon I'll be shilling my own models everywhere!
>>626585
I know there are ways to mathematically create models but can't you just iterate faster with paper in hand?
Then you just trace over photos.
I don't think anyone is using physics simulators to create their diagrams. In addition, diagrams often have over-exaggerated proportions on some steps to make them easier to read/understood by the reader (instead of being realistic).