Keith Dysart wrote:

Sounds good, but mostly you do not examine
ideal conditions because they tend to show that
the models fail. With non-ideal conditions, the
discussion is easy to drive far from the target
and prevent resolution of whether the model
works.

My postulate is that Newton was wrong: moving objects come to a rest
without any external applied force. Every observation made supports
this. There's no need to consider what happens in a frictionless
environment, since such a thing doesn't exist.

Roy Lewallen, W7EL