Question

Why is there an upward force (Buoyant force) acting on an object when placed in water ?

Answer 1

$$\begin{gathered} \mathrm{Buoyant}\mathrm{force}\mathrm{is}\mathrm{the}\mathrm{reaction}\mathrm{of}\mathrm{water}\mathrm{on}\mathrm{the}\mathrm{opposite} \\ \mathrm{to}\mathrm{that}\mathrm{action}\mathrm{of}\mathrm{object}\mathrm{placed}\mathrm{in}\mathrm{water}\mathrm{which}\mathrm{is} \\ \mathrm{the}\mathrm{weight}\mathrm{of}\mathrm{the}\mathrm{object}. \\ \mathrm{So} \\ \mathrm{Buoyant}\mathrm{force}-\mathrm{reaction}\mathrm{of}\mathrm{water}\mathrm{on}\mathrm{the}\mathrm{object}. \\ \mathrm{Weight}\mathrm{of}\mathrm{the}\mathrm{object}-\mathrm{action}\mathrm{on}\mathrm{water}. \end{gathered}$$