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It seems to me that a few messages back in this thread,
Bob Sciamanda supplied perhaps the best phrased answer
to what I take as your fundamental concern. To paraphrase Bob:
In its simple attempt to obey Newton's first and second laws, the
object is continually colliding with the track. As a result, the
track and the object deform (as is ALWAYS the case when two
objects come into "contact") and the deformation is responsible
(as it ALWAYS is) for the resulting "contact interaction."
. . . Progress necessitates doing some things
differently from our predecessors. Let's figure
out what is the right thing and do it.