Is it possible to consider a balloon as a material point when determining the Archimedean force acting on a balloon in the air.
For a balloon, the Archimedes force FА = ρVg,
where – ρ is the density of air,
V is the volume of the sphere,
g is the acceleration of gravity.
If the ball is considered a material point, then the volume V = 0, and the calculated buoyancy (lift) force is also zero. In reality, however, the volume and density of the gas filling the ball determine its ability to aeronautics.
Answer: A balloon cannot be considered a material point.
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