Here is a little representation including basic instances : Mass, Velocity and Time.     Mass is the vertical axis. Time is horizontal (front) Velocity is horizontal (back) Distance is the product of Time with Velocity, i.e. the grey surface. The yellow surface is Momentum. The entire cube has units of mass times distance (kg m), something like torque (or work). What is the last surface standing for (the one with the red diagonals)? its value is Mass times Time. What is MT? ??Somethi