Question

A static fluid can have

• A. Positive normal stress and zero shear stress
• B. Zero normal stress and non-zero shear stress
• C. Non-zero normal stress and non-zero shear strees
• D. Positive normal stress and non-zero shear stress

Answer 1

Answer:

A. Positive normal stress and zero shear stress

A static fluid cannot sustain shear stress as it lacks the rigidity to resist deformation under shear forces. Therefore, options involving non-zero shear stress are incorrect. Fluids at rest can only exert normal stresses, which are pressure forces acting perpendicular to any surface. Hence, the correct scenario involves positive normal stress and zero shear stress.