Which of the following forces act on a fluid at rest?
(1) Gravity force
(2) Hydrostatic force
(3) Surface tension
(4) Viscous force
Select the correct answer using the codes given below.
Option (A)
1, 2, 3 and 4
Option (B)
1, 2 and 3
2 and 4
1, 3 and 4
Correct Option:
Question Solution:
A fluid at rest there can be no shear force (i.e. viscous force), The only forces acting on the free body are the normal pressure forces, exerted by the surrounding fluid on the plane surface and the weight of the element.