What is the cause of upthrust? At which point can it be considered to act?
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Upthrust force is caused due to the difference of pressures between lower and upper surfaces of the immersed body in a fluid. It can be considered to act at the centre of gravity of the displaced fluid.
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The upthrust is considered to act at the center of buoyancy i.e., the center of gravity of the displaced fluid. Liquid exerts pressure at all points and in all directions when contained in a vessel, this pressure on a liquid is the same in all directions and increases with depth inside the liquid.
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