Physics decided to check what happens to the total weight of the truck carrying pigeons, if birds begin to fly. The results of own research, the authors have published in the Royal Society Journal Interface, and briefly they can be found on the website of The Telegraph.
It turns out that the total weight of the machine at all this will change. So, when the dove in flight will be lower wings, the total weight of the machine will increase by an amount approximately equal to the weight of 2 birds. This is due to the pressure exerted wings of a dove on the underlying column of air. Conversely, when the bird raises its wings, it will mean that the weight of the bird when the combined weight of the truck can be neglected.
According to the findings of researchers, to make the deviation of the weight of the machine zero is quite likely in the case of a sufficiently large number of birds for which the total number of movements of the wings up and down about would match.
Weight is the force with which the body acts on the support or thread suspension due to terrestrial gravity. Unlike mass (rest), which is a constant value and at the same time a measure of inertia (this value is in the 2nd Newton's law) and a measure of the gravitational interaction (is the law of global gravity, the weight depends on the gravitational field and motion support (or thread suspension).
In daily life, when all bodies are on the surface of the Earth at rest, body mass and weight are proportional to each other (with a coefficient of proportionality equal to the value of the acceleration is independent of the fall), and they are often not distinguished from each other (virtually speaking of weight, for example, on this planet, have in mind the weight of his body).
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