Question

explain why objects moving in fluids must have special shapes

Answer 1

Answer: When a body moves through a fluid, it experiences an opposing force which tries to oppose its motion through the fluid. By giving objects a special shape, the force of friction acting on it can be minimized.

Answer 2

moving object in Fluids have streamlined shape because when a body moves through a fluid it experience and opposing force which tries to oppose its motion through a fluid this frictional force depends on the shape of the body .By giving object a special shape,that is streamlined shape,the force of friction acting on it can be minimised .Hence, it becomes easier for the body to move through the fluid.