How would the force stop moving, if it is unstoppable. By "moving" I mean a slight vibration of its molecyles from the energy transfered from the force to the object. Basic physics, I guess. But might as well be heat energy instead of kinetic energy, though it would still make the molecyles move a bit.
The Unstoppable Force would move to hit the Immovable Object, but the Immovable Object would stay still. The Unstoppable Force would then move around the Immovable Object and search for a Movable Object... Especially if the Immovable Object had only a little surface area, not unlike a bullet...
Hey, even though its not physically correct, I have an idea...
Lets say that the Immovable Object, is concrete, and the Unstoppable Force is a car... The Unstoppable Force would collide with the Immovable Object, and may damage it... Now... The Unstoppable Force hit the edge of the Immoveable Object, and rebounded, losing speed, and no longer Unstoppable... The Immovable Object, was also damaged, and no longer was it Immovable...
This is physically impossible, because for either an unstoppable force or an immovable object to exist, both would have to be infinite, which is impossible in a finite universe.