Avram > And I am simply trying to extract a lesson about dan l’kaf zechus and regarding your fellow Jews with basic respect.
Ok, I think we both made the point and understood each other. Apologize to the readers for this long thread. For full disclosure, when I was listening to the frictionless plane classes, I would also interrupt asking about every possible real life artifacts. And what is more important in practice? All planes deal well with obvious gravity. Better ones are dealing better with friction and other smaller factors.