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... P&C does have a useful, if limited, role. Get the
students to make some simple calculations of, for example momenta for
many different items, or rest energies for lots of things of wildly
varying sizes. Doing one or two of these sorts of problems at the
very beginning gives the student a "feel for the numbers." What is a
typical energy range for a car, for a human, for an atom, for the
Exxon Valdez (now that it's back at sea), for a comet, whatever.