  This paper presents some ideas which might assist teachers incorporating
special relativity into an introductory physics curriculum. One can define the
proper-time/velocity pair, as well as the coordinate-time/velocity pair, of a
traveler using only distances measured with respect to a single ``map'' frame.
When this is done, the relativistic equations for momentum, energy, constant
acceleration, and force take on forms strikingly similar to their Newtonian
counterparts. Thus high-school and college students not ready for Lorentz
transforms may solve relativistic versions of any single-frame Newtonian
problems they have mastered. We further show that multi-frame calculations
(like the velocity-addition rule) acquire simplicity and/or utility not found
using coordinate-velocity alone.
