A balloon is inflated and released. Why does it fly forward as air escapes out of it?
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When a balloon is inflated, the air inside it is under pressure. In the event that the air is left to escape from the balloon, the pressure produces a force(thrust). The thrust propels the balloon in the opposite direction as the direction of the air leaving the balloon.This is in line with Newton's third law of motion which states that for every action there is an equal and opposite reaction.
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Air escapes from the balloon that carries momentum. By momentum conservation, the balloon acquires momentum which is exactly opposite to the momentum of the escaping air. Therefore, it flies in a direction which is opposite to the velocity of the escaping air.
Explanation:
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