a bird resting on the floor of an airtight box which is being carried by a boy starts flying the boy will feel that the box is now
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Answer:no net change
Explanation:
Assuming that the box is sealed, it would make no difference at all. As the bird flies the bird's wings push air downward. As a result of Newton's 3rd Law of Motion for every action there is an equal, but opposite reaction. Therefore, the air pushes upward on the bird enabling the bird to fly. In a closed box, however, this downward moving air collides with the bottom of the box! This means that the force being used to lift the bird is ultimately being supplied by the bottom of the box. No net change!
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