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It's due to resistance. If you are in the car roll down the window and put your hand into the air stream (provided it's safe to do so). First hold it upright with your palm flat, you will feel the wind pushing against your hand. Then tilt your hand so it is horizontal and you will notice there is a lot less resistance.

If you have a large flat or blunt shape it will take a lot more energy to move it. This is why aircraft (with the exception of some cargo aircraft) are streamlined.

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Q: How does the shape of a plane affect speed?
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