Shrinking units in ARKit

I'm building a game using ARKit where the game objects are smaller than they would be in real life. For example, a basketball in the game is the size of a real life marble versus the size of a real life basketball. This make physics difficult, because the scene is configured so that objects act exactly as they would in the real world. So my small basketball behaves physically different than it should since the scene does not view it as the size of a normal basketball.


So my question is, is there a way to make my scene treat one unit as 1/10 of a meter instead of 1 meter (the default) so that my objects will shrink, but I don't have to worry about messing with scaling all objects and altering the default physics properties of each object?