free fall of bodies
We verified the absence of apparent weight of a falling body through the law of Stevin. This law states that the difference between the pressures at two points of a fluid in equilibrium in the presence of gravity is given by the pressure exerted at the base by a fluid column height equal to the difference between the two points. We can therefore write: AP = ρgh.
We took a plastic bottle and made a hole a few inches from the bottom. We filled the water bottle so that h is the depth of the hole from the surface of the water and we adjourned to a 'considerable height (eg standing on a table or a chair). The water pressure is p = ρgh, where ρ is its density. We observed a gush of liquid out of the hole, perpendicular to the surface of bottle. We then dropped the bottle freely: the system is the same water bottle + of + passenger elevator system studied in theory. The apparent weight of the water bottle in the frame in free fall is zero, so it's nothing the pressure p calculated according to the law of Stevin. According to forecasts, the gush of water ceases to flow.
We verified the absence of apparent weight of a falling body through the law of Stevin. This law states that the difference between the pressures at two points of a fluid in equilibrium in the presence of gravity is given by the pressure exerted at the base by a fluid column height equal to the difference between the two points. We can therefore write: AP = ρgh.
We took a plastic bottle and made a hole a few inches from the bottom. We filled the water bottle so that h is the depth of the hole from the surface of the water and we adjourned to a 'considerable height (eg standing on a table or a chair). The water pressure is p = ρgh, where ρ is its density. We observed a gush of liquid out of the hole, perpendicular to the surface of bottle. We then dropped the bottle freely: the system is the same water bottle + of + passenger elevator system studied in theory. The apparent weight of the water bottle in the frame in free fall is zero, so it's nothing the pressure p calculated according to the law of Stevin. According to forecasts, the gush of water ceases to flow.
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