If a cube submerged in water is attached to the floor with a telescopic cylinder taking up part of the surface area on the bottom of the cube, will the buoyant upward force be a fraction of the surface area on the bottom of the cube exposed to water, or will the full buoyancy effect take place, as long as at least a little of the bottom surface area of the cube is exposed. Assume the cube is less dense than the water it is in. Assume the telescopic cylinder does not create any tensive or vacuum force, and is ridgid. It is just preventing some of the water from contacting part of the bottom surface of the cube. From what I have read on the forums, if the ENTIRE bottom of the cube is not in contact with water the cube will have NO buoyant uplift. My question is what if only part of the bottom surface of the cube is in contact with water? Do I calculate buoyant force normally and multiply by the fraction of bottom surface area that water comes in contact with? Or, does the entire normal Buoyant force get applied.