so i was playing with force and around 5000 i get something unexpected.
It turns out that the cube will move with so much force that wall won't stop it.
i am not sure if the collider has a "break" point or if it is just a bug
Yes you're kind of right. With very fast moving objects rigidbodies tend to just go through colliders. On the Rigidbody itself you can change the collision detection to continuous. Though this does affect performance so I'd use it sparingly. Nonetheless with fast moving objects that's the recommended solution.
oh, so it has to do with the collision detection. That is cool to know.