Irresistible force paradox
What happens when an irresistible force meets an immovable object? / From Wikipedia, the free encyclopedia
"Unstoppable force" redirects here. For the album, see Unstoppable Force.
The irresistible force paradox (also unstoppable force paradox or shield and spear paradox), is a classic paradox formulated as "What happens when an unstoppable force meets an immovable object?" The immovable object and the unstoppable 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 entities.
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The paradox arises because it rests on two incompatible premises—that there can exist simultaneously such things as unstoppable forces and immovable objects.[1]