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 Mar 9 awarded Popular Question Aug 30 accepted Jupiter: Zonal Jets in opposite directions Apr 2 accepted Hydrostatic pressure at lateral directions Apr 2 comment Hydrostatic pressure at lateral directions Ah I think I get it now -- "the same pressure distribution" leading to "the same total force resulting from hydrostatic pressure" is a result of pressure itself not being a vector, but being a scalar quantity. Apr 2 awarded Commentator Apr 2 comment Hydrostatic pressure at lateral directions From the first link, "The sides are identical in area, and have the same depth distribution, therefore they also have the same pressure distribution, and consequently the same total force resulting from hydrostatic pressure, exerted perpendicular to the plane of the surface of each side." Can you care to elaborate on this? I still do not really understand why the pressure acting on the top face must be equal to the pressure acting on the side, directly below the top face. Apr 2 asked Hydrostatic pressure at lateral directions Apr 2 accepted Vector Addition — Direction Mar 27 awarded Citizen Patrol Mar 26 comment Vector Addition — Direction @MichaelBrown, I think I've sorted it out. I think this all arose from a misunderstanding from a physics book thing. Must've been a typo. Thanks though! Mar 26 comment Vector Addition — Direction Mar 26 revised Vector Addition — Direction added 265 characters in body Mar 26 comment Vector Addition — Direction So if I wanted to describe a system of forces and wrote $F_1$ + $F_2$ = $F_3$, $F_3$ is in the opposite direction as $F_1$? But then what about $\Sigma F = ma$? with subtraction we'd say they have opposite directions, but then, they don't right? Mar 26 awarded Editor Mar 26 revised Vector Addition — Direction constrained example Mar 26 comment Vector Addition — Direction @Debangshu, yes but say $F_1$ and $F_2$ have the same direction and magnitude, and $F_3$ had double their magnitude, and in the opposite direction. $(1)$ would hold, and by subtraction $(2)$ seems to be logically correct. But then $(3)$ would also be true based on what I said about $(1)$, which seems to confuse me. Mar 26 comment Vector Addition — Direction @Debangshu, I'm aware of that, but what of the case where $F1$ and $F2$ are of the same direction? $(1)$ still holds, no? Mar 26 comment Vector Addition — Direction @MichaelBrown I don't know, if two vectors have the same direction and magnitude, should they not equate? Mar 26 asked Vector Addition — Direction Feb 11 awarded Supporter