Why does fluid cannot transfer any shear stress to solid?
Answers
Answer:
Explanation:
Fluid molecules aren’t held together in position like solid molecules are. It might be easier to understand this if you think about fine sand instead of fluids, since you can actually see sand particles. Find a lump of sand and brush your hand on top of the sand. The sand would move (shear), and your hand would feel some resistance. Try doing the same with a rock- it wouldn’t shear at all. The difference is because sand particles aren’t held together, while all the elements of a rock are held in place by molecular bonds. Fluids have even weaker inter-molecular forces than sand, so they have little resistance to shear.
Having said that, fluids do resist shear stress. Except they respond with a strain-rate instead of just strain. But this is probably something you’ll learn much later.