- #1
SurajBahuguna
- 2
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I have been told by my teacher that the surface of a fluid is always perpendicular to the net force acting on it. The reason being a fluid can not withstand tangential stress and if a shear stress is applied to it, it will slip until the surface becomes perendicular to the net force. So my question is why the surface of water is horizontal in a vessl at rest even when the net force acting on it is zero? Also why does it become diagonal(and not vertical) when it is given some horizontal accleration?