Detect if physics object is on ground or not.

Hi is there a simple way to detect if a physics object is on the ground or not.

I tried

Sytem.EveryTick                   /

     - Ball1.isOverlappingGround / Output.setText("OnGround:)

     - Ball2.isOverlappingGround /   

Sytem.EveryTick                           /

     - Ball1.isOverlappingGround{Invert} / Output.setText("NotOnGround:)

     - Ball2.isOverlappingGround{Invert} /

you can try

System: Every tick
  -> Ball: set onGround to false
  -> Ball: set Y to self.Y+1
Ball: is overlapping Ground
  -> Ball: set onGround to true
System: Every tick
  -> Ball: set Y to self.Y-1