Question

Why cars, airoplanes and rockets are streamlined??

Answer 1

Cars, Aeroplanes, Rockets are streamlined in order to reduce frictional forces such that the bodies are move fastly and easily.

Answer 2

aeroplanes and cars have a streamlined shape because it reduces the amount of air drag/air resistance,rhus allowing less amount of energy  to be wasted.if they r streamlined when they flow through the air,the car can move smoothly,non clumsy like moments