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-----Original Message-----[snip]
From: phys-l-bounces@mail.phys-l.org [mailto:phys-l-bounces@mail.phys-
l.org] On Behalf Of Brian McInnes
However the way these real world things are treated take the problems way,
way from reality. The momentum of the bowling ball doubles (how?); the
kinetic energy of the ball doubles (how?); the radius of the track doubles
(how?); the rain immediately halves the
coefficient of friction (how?); the mass of the car doubles (how?).
All these "hows" are non-trivial. Certainly they all convey to students the
message that the physics they are being taught and being examined about
has little (nothing?) to do with the real world.