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When you hold your hand outside the window of a car in motion, your hand is only pushed upwards if you incline it upwards. If you incline it downwards, it will
by civilized 5y ago
When you hold your hand outside the window of a car in motion, your hand is only pushed upwards if you incline it upwards. If you incline it downwards, it will be pushed down. This is the angle-of-attack effect and simply relies on the normal force of the air striking the hand. If the hand is inclined upwards, the normal force has an upward component, creating lift.