Some time ago a heard that a truck filled with chickens would weigh the same if the chickens either are on the floor of the truck or if they are hovering just under the roof. The reasoning is that the chickens are part of the same «system» as the truck, so the whole «system» would always weigh the same, even if the objects inside it is not in contact with it physically. Can someone explain what is meant by this «system» and if this is a true statement?
Thank you!
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I’m with you guys to a point, but it might not be that simple. err, momentum and time. Imagine a truck with enough bouncy balls to cover the floor. Truck tops a hill, all of the balls are momentarily thrust into the air, and there is not one fraction of a newton exerted on the floor at that instant. I’m not saying the energy changed, as it was converted to kinetic as the balls went up, but weight? Yep it changed.
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