It's not a good idea to mix Physics with other behaviors like Bullet, Drag&Drop, Pin etc. Also, Physics objects don't like sudden and sharp changes in movement.
I made a similar demo for another post, where a clone "fake" stationary bucket is used to simulate physics:
dropbox.com/s/z4hm5wqt4g7fe1z/apples.capx
You can improve it, make it look more realistic by applying small forces/impulses to the clone bucket, in the same direction where the primary bucket is dragged.