with it. when i run the preview, i can drag the cube around just fine, and if i fling the cube it flies off in that direction and rolls around just like i would expect it too.
a problem occurs when i duplicate the cube and run the preview. both cubes can still be dragged around, but they cannot be flung. if i try to fling either of them, the moment i let go of the mouse button the cube stops moving completely. if it happens to be in the air at the time, then it floats back down very, very slowly as if there is almost no gravity.
so this is 