   Making objects fall at a certain speed
  i have textured quads moving down the screen by 0.005f everytime which seems to be ok on my machine but since this will change on a different machine due to graphics processing speeds how can i keep it the same.Thanks  
  The common way to solve such problems is to measure FPS and set the speed of your falling object depending on these results.  ;  Update the position based on the time differenceposition_vector += time_difference * speed_vector  ;  personally im using a fixed timewstep now for physics, check out flipcode about 3/4 months ago for a good discussion on it  