Peter Gebauer wrote:
I don't have a clue about the math involved to calculate the force, but I could give it a stab.
As Archimedes pointed out, the upward force on an immersed body is equal to the weight of water it displaces. So just apply a force proportional to the volume that is under the water. You'll also want a drag force proportional to the velocity of the body and the immersed volume, to stop it from accelerating indefinitely while submerged, and to damp down oscillations when it's floating on the surface. -- Greg
