The
irresistible force paradox, also called the
unstoppable force paradox or
shield and spear paradox, is a classic
paradox formulated as "What happens when an unstoppable force meets an immovable object?" This paradox is a form of the
omnipotence paradox, which is a simple demonstration that challenges omnipotence: "Can God create a stone so heavy that not even God is strong enough to lift it?" The immovable object and the irresistible force are both implicitly assumed to be indestructible, or else the question would have a trivial resolution. Furthermore, it is assumed that they are two separate entities.