Question

What is a streamlined body? How is it helpful for a body to have such a shape.

Answer 1

the shape of the body when it is tapering thin at 2 ends and thick in the middle..... like in fishes,ships...etc
it helps a body to swim or float easily by reducing the viscous force due to water

Answer 2

A streamlined body is a shape that lowers the friction drag between a fluid, like air and water, and an object moving through that fluid. Drag is a force that slows down motion; friction drag is a special kind of drag. It occurs when the fluid closest to the object sticks to its surface, exerting a force that opposes the object’s motion. Many animals, such as birds and dolphins, and many machines, such as airplanes and submarines, have streamlined bodies to reduce friction drag as they move through either air or water.

A special shape of the bodies which reduces the fluid friction is called as the streamlined shape. ... Streamlined shapes help reduce the amount of air drag when an object is moving. This allows the object to use less energy in the movement.