In case of solids, the force can be applied in any direction with respect to the surface. However, in
case of fluids (liquid/gases) at rest
, the force must be applied at right angles to the liquid surface.
This is because fluids, at rest, cannot sustain a tangential force. We, therefore, usually speak in terms
of pressure in their case.
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BUT IN CASE OF FLUIDS(LIQUID/GASES),THE FORCE MUST BE APPLIED AT RIGHT ANGLES TO THE LIQUID SURFACE.THIS IS BECAUSE FLUIDS,AT REST,CANNOT SUSTAIN A TANGENTIAL FORCE.WE,THEREFORE,USUALLY SPEAK IN TERMS OF PRESSURE IN THEIR CASE.
Explanation:
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