Question

'A fluid is at rest' means that
1. it has zero normal stress and non-zero shear stress
2. it has non-zero normal stress and zero shear stress
3. it has non-zero normal stress and shear stress
4. it has zero normal stress and zero shear stress

Answer 1

Correct Answer - Option 2 : it has non-zero normal stress and zero shear stress

Explanation:

Static fluid

• Static fluid, fluid at rest has no shear stress.
• Consequently, any force developed is only due to normal stresses i.e., pressure.
• Such a condition is termed the hydrostatic condition.