Let us say it has got displaced by an amount z. How much is my total buoyancy force?
Total buoyancy force is now the weight of the displaced water of this entire thing, but of
these this mean part is balanced by the weight. So, the unbalanced force that acts the
unbalanced part of the static force is of course, the weight of this mass. Now, how much
is this? This is of course, rho g A w p, it is like parallel sinkage into z, assuming of
course A z A w p is constant, but strictly it should have been rho g A w p z dz integration
over that part.