This thread is so full of bad science and bad math that it makes me want to cry. Only not really.
A few people have pointed out the obvious, like that it is vacuous. It has absolutely nothing to do with the laws of physics, only the meanings of unstoppable and unmoveable (and maybe the definition of force)
First, the question: What happens when an unstoppable force hits an unmovable force?
Well, in the physical world, moveableness is not a property of forces. Also, forces don\'t hit each other. What was meant was: \"What happens when an irresistableforce is exerted on an unmovable object\".
This is logically equivalent to \"What if True were False\" in which case you would be able to prove anything, but for no value. So far we believe that this is not the case.
You cannot take infinity and subtract infinity and get 0, as infinity is not a quantity that can be manipulated in that fashion. Infinity can be used to measure the size of a set - for instance, if I take the size of the set of positive integers (an infinite number of them) and subtract out all the odd ones (still an infinite number of them).. what do I get? Still an infinite set! Whoo!
Now can anyone tell what happens when two singularitys collide?
From the outside, they would act like one singularity. Depending on your frame of reference they might just get asymptotically closer and never touch, not really sure about that.
Why must we be constrained to a single strain of thought according to your \"laws\"? .
You don\'t have to, it\'s just practical, has observable results, and explains many phenomena in a consistant and predictable way. For instance, if I have a dollar, and someone else gives me a dollar, then it is reasonable to predict that I have two dollars. If you phrase something in the language of physics and logic, convention is that you are asking people to apply the theories of physics and the theorems of logic. A \"law\" is just a theory that seems pretty well verified by observation.
You could apply your own set of beliefs to the question. What happens when an unmovable force is exerted on an unstoppable velocity? Cheese!