Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of cohesion
force of adhesion
force of diffusion
force of friction

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Hydraulics & Fluid Mechanics
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

zero at plates and increases linearly to midpoint
parabolic distribution across the section
zero at the mid plane and varies linearly with distance from mid plane
constant over the cross section

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

force on a vertical projection of the curved surface
product of pressure intensity at its centroid and area
force on the horizontal projection of the curved surface
weight of liquid vertically above the curved surface

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