why should objects moving in a fluid have a specific shape
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The fluid is the name given to a substance which begins to flow when an external force is applied to it. Objects moving in fluids face the friction of the fluid that opposes their motion. So Objects moving in fluids must have unique shapes called streamlined shapes to reduce the fluid friction.
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Moving objects in fluid must have special shapes because the drag force or the friction force depends of the shape of the object. Special shapes are designed to minimize the opposing frictional force.
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