Question

explain why objects moving in fluids must have special shapes​

Answer 1

Answer:

The fluid is the name given to a substance which begins to flow when an external force is applied to it. ... So Objects moving in fluids must have unique shapes called streamlined shapes to reduce the fluid friction.

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Answer 2

Hello Friend,

I hope You understand this

Answer:

When a body moves through a fluid, it experiences an opposing force That tries to oppose its motion through the fluid. This opposing force is known as the drag force. This frictional force depends on the shape of the body. By giving the objects a special shape, the force of friction acting on it can be minimized. Hence, it becomes easier for a body to move through the fluid.

OR

Moving objects in fluid must have special shapes because the drag force or the friction force depends on the shape of the object. Special shapes are designed to minimize the opposing frictional force.