long answer type question
what do you mean by streamlined shape? how does it how in the motion of vehicle
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streamlined body is used for reducing friction.u can see this in the case of birds,ships and aeroplanes.
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when object moves through fluid such as water on air they have to over come fluid friction acting on them . In this process they lose energy and over all efficiency decreases . So the object moving in fluid are modify and given special shape in order to save energy which is being wasted against fluid friction. Such modify shape are known as streamlined shape or aerodynamic shape . These kind of modify shape help in reducing fluid friction.
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