[SketchyPhysics] Need help for the sketchyphysics model

circle tube.skp (1.4 MB)

I have made a simple model containing circular tube and color ball. I want to make that should fall in the tube and then slide and rotate inside the tube and come out from the other end of the tube.

After playing the button there is no reaction to the ball as its not dropping down and
rotating inside the circular tube.

i tried much i give up any help from the experts