|MadSci Network: Physics|
In an aeroplane full of birds, whether on the ground or in the air, the weight of the ‘plane and birds will not change if the birds take flight. When the birds are flying their bodies and wings are pressing down on the air below them, which presses on the air below that and so on creating a downwards push against the floor of the ‘plane. This results in a downward force equal to their weight. You might like to try this for yourself if you can get hold of a sensitive set of scales, a box and some small objects like feathers that take a long time to fall. Weigh the box with the feathers settled on its floor then shake it and weigh it again as the feathers are falling. Does the weight change ?
Try the links in the MadSci Library for more information on Physics.
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