# Is the Galilean Cannon a demonstration of Newton's Third Law? How?

If it is, then how would one calculate the force acting upon each segment of the cannon. I was wondering if you could use F=ma to calculate the opposite reaction force the floor would exert to the bottom segment, then add that to the opposite reaction force exerted when the second segment hits the bottom segment. Sorry if this makes no sense at all, I haven't been doing Newtonian physics for long.