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Cause it reduces the amount of air drag thus allowing less amount of energy to be wasted and reducing the friction. if cars were designed like trucks it would increase friction which would be a gr8 problem for racing cars. this goes same for the planes .
to move swiftly in the air
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Aeroplanes and cars have a streamlined shape because it reduces the amount of air resistance, thus allowing less amounts of energy to be wasted.
Hence, reducing friction.
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Airplanes and cars have a streamlined body to decrease the amount of air resistance , so that it can cut the air and go through it . It is helpful in saving energy .
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