Answer: (2)
A streamlined body is a shape that decreases the friction drag between a fluid, such as air and water, and an object that passes through that fluid. Drag is the force that reduces the speed of the motion.
- The aeroplanes and ships have streamlined shaped bodies to reduce drag. The streamlined shaped body experiences minimum resistance when travelling through water or air. It helps to reduce friction.
- Drag Force (D) is defined as the force that resists the motion of a body with fluid.
- If the motion of the body exists in the fluid-like air, it is known as aerodynamic drag. And, if the fluid is water, it is known as hydrodynamic drag.
- The drag force always acts in the opposite direction to the flow of fluid.
