OmCheeto
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collinsmark said:It can get tricky. And the trick is to remember Archimedes.
Wasn't he in Random Thoughts just a few days back, destroying ships and stuff?
http://hyperphysics.phy-astr.gsu.edu/hbase/pbuoy.html
I don't think it has anything to do with buoyancy. If you draw a free body diagram of a square, placed in a level liquid, the only net liquid force is on the bottom. If you tilt the liquid to 45 degrees, keeping the square level, there will be a net force opposite the direction that the square actually goes!
I think it may have more to do with the capillary action. Looking at the cork-water-glass system, it's obvious that there are curved surfaces, almost like gravitational fields. But describing how the cohesive/adhesive forces pull the cork to the position where the water-cork-glass system is at its lowest energy state, is beyond my abilities.