A bird is sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Will the girl experience any change in the weight of the cage when the bird (i) starts flying in the cage with a constant velocity (ii) flies upwards with acceleration (iii) flies downwards with acceleration?

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Solution

(i) When bird start flying with constant velocity then girl will nor experience any extra force.
(ii) When bird move upward with some acceleration, then bird would push the air in downward direction hence girl will experience more force.
(iii) when bird move in downward direction then bird would push the air in upward direction and force experienced by the girl would get reduced.

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