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As for agents of a force, how imaginary is gravity?
That's fine as long as they can keep straight when the Newtonian principles apply and when they don't (or give up on Newton entirely). ;-)
Let's hear it for the Principle of Equivalence and a possible extension to
Centrifugal Fields. I notice such every time in the winter when I turn left
and feel hot air come my way. High school students can easily grasp such
ideas.