This question already has an answer here:
I honestly don't think there is a way to do this, but I am curious. Is there anyway within the collision physics to allow one specific axis to be animated while the other 2 are not animated and dynamic? What I mean is, say I wanted to animate an object to move on a specific path on the X-Axis, but I still want the Y and the Z axis to change according to the physics simulations. Any ideas?