From: ftlsite@hotmail.com   
      
   In your opinion does the following passage, written in a conversational=20   
   style, express enough accuracy to be included in a popular science=20   
   article on the topic of motion without being too 'soft'?   
      
   "... to answer this question, we need to find what forms of motion can=20   
   occur in a single spatial dimension, and then multiply the result by=20   
   three to account for all possible directions in three-dimensional space.   
   First, obviously, is no motion at all. This would be the simplest case:=20   
   unchanging position. Next, there is motion at a constant speed. Position=20   
   that varies in a constant, unchanging way with respect to time =E2=80=93 =   
   this=20   
   form of motion is also the solution of the first derivative of position=20   
   with respect to time. Then there is the case of accelerated motion, or=20   
   the rate of change of speed with respect to time, which is also the=20   
   solution to the second derivative of position with respect to time.   
   Are there any other forms of one-dimensional motion? Well, the rate of=20   
   change of acceleration with respect to time is called jerk, the third=20   
   derivative of position with respect to time, but it can be expressed as=20   
   an acceleration of an acceleration.  It all boils down to three=20   
   conditions: no motion, constant motion, or accelerated motion. So, it=20   
   seems, there are only three forms of motion that can occur in a single=20   
   spatial dimension."   
      
   Thanks for your input.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)