2 ms·
Because moving in any direction down the dome requires epsilon momentum from an application of epsilon force, which is not present in the assumed setup.
by kobeya 9y ago
Because moving in any direction down the dome requires epsilon momentum from an application of epsilon force, which is not present in the assumed setup.
- xvedejas 9y agoThere is an explanation in the article as to why a causative force is not required to obey Newtonian mechanics. At every moment that the ball is moving, there is indeed an external force due to gravity.
- eru 9y agoIndeed. If you want to challenge the example, you need to argue that in reality things are never quite so finely balanced, and that we can thus assume what geometers call "general position". (https://en.wikipedia.org/wiki/General_position https://en.wikipedia.org/wiki/General_position)
- kobeya 9y agoThe ball is never moving at any time ever.