Question

why are objects given special shapes when they are moving through fluid?

Answer 1

When they move throw a fluid the particles THat have low mass and high velocity comes forword and low velocity comes back and because of viscosity , temperature and density they change as well.

Answer 2

Objects moving in fluidsfaces the fluid friction which opposes their motion. So to reduce the fluidfriction Objects moving in fluids must have special shapes called streamlined shapes.