scott_powell wrote:Right ... Those of you who think it's a penalty ...
Yes we have established that there is contact as Leahy's arms are on his back but as you all know this is a contact sport ... Do you think there is enough force there to push a professional athlete to the ground?
To answer that we need to consider Mechanical energy. This the sum of kinetic and potential energy in an object that is used to do work. In other words, it was the energy in Leahy due to his motion or position, or both. In 'pushing' over the attacker he possessed potential chemical energy (energy stored in him), and by lifting his hands to push the attacker his action also had kinetic energy (energy -but not electrical! - in the motion of his hands). By pushing the attacker, Leahy's potential and kinetic energy was transferred into mechanical energy, which caused work to be done (ie attacker fell over). Here, the attacker gained mechanical energy, which caused him to be displaced/fall over.
I hope this clears up the matter once and for all.