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I think this (Modeling) approach does a
much better job of helping beginning
students learn the fundamental concepts.
Is there any reason for thinking so?
Should we tell beginning English students to say "aint" and "they is",
knowing that it is bad English, and hoping that they will unlearn it
later? By the same token, what is the point of teaching beginning students
bad physics, for no discernible reason, when better approaches are available?
And you never
have to use the hated word "flow" to describe the
processes.
Hatred is not a substitute for careful reasoning. If flow is unphysical,
somebody needs to explain why. See also
http://www.monmouth.com/~jsd/physics/conservative-flow.htm