momentum

  i climb on the bus,
    flash my pass,
   we start to roll
    and my feet slide on
   the wet floor.

  the bus lurches forward,
   its motion pulling my feet 
   out from under
    my centre of gravity.

   lucky-- there's a hand rail
    beside me,
   so i grab it 
     and heave myself into a seat,
    weight shifting from
     its down-backwards 
   momentum. ->