I've experimented a little and noted that some objects follow the same pattern, and some objects don't. If I position a "falling" object near a "non-falling" object the non falling object will fall, as long as the falling object is bigger. In other instances even the falling object stays floating in the air, so these experiments are inconclusive at best, and now I'm more confused than when I started.
In conclusion: Is there a way to make corpses fall to the ground without player intervention?
Thanks.