Module 3: Hydrostatic forces on submerged bodies
Lecture 6: Calculation of vertical component
The answer is:
It is
for the 1
st
case and
for the 2
nd
case.
(Fig. 6h)
(Fig. 6i)
It is always the weight of the liquid column trapped between the surface and the free surface of the liquid.
Note:
along ‘AB'. Therefore, the pressure on AB is the same as that on any horizontal surface at the same altitude or depth.
for the 1st case and
for the 2nd case. 
along ‘AB'. Therefore, the pressure on AB is the same as that on any horizontal surface at the same altitude or depth. 
