Immovable object vs. Unstoppable force

@vivify said
For those who don't want to click the video: the video concludes that immovable and unstoppable object would pass through each other.

Im straying out of my lane here but.... wouldnt it depend on the density of the objects?

@Sprogladog said
Im straying out of my lane here but.... wouldnt it depend on the density of the objects?

An unstoppable force and an immovable object are the same thing.

An immovable object cannot accelerate. If you could make it accelerate, it would not be immovable.

An unstoppable force also cannot accelerate or decelerate. If you could change it's acceleration, that means you could affect it's momentum and it would not be unstoppable.

The only way an object or force could be unstoppable or immovable would be if they both had infinite mass.

Two infinite mass objects that cannot decelerate; the only option left would be that they'd pass through each other. The density wouldn't matter.

Obviously, infinite mass is impossible anyway, and it's just a thought experiment.