![]() ![]() These are different statements because hydrostatic pressure is being applied to the entire surface of the tank (and hence the entire surface is pushing back by Newton's $3$rd law), so the force at the bottom is not the only thing coming into play in the force balance. The point is that the net vertical force on the water must be zero, which is distinct from requiring that the force from the tank bottom be equal to gravity. This might seem surprising, however, because we intuitively expect the tank to only need to feel the force necessary to support the water's weight- so where's the disconnect? The water level is indicated on a scale on the side of the quadrant.As others have discussed, the computations are computing different things, but only the second approach yields the total force on the bottom of the tank. Water is added to the tank via a flexible tube and may be drained through a valve in the side of the tank. An indicator attached to the side of the tank shows when the balance arm is horizontal. Correct alignment is indicated on a circular spirit level mounted on the base of the tank. ![]() This assembly is mounted on top of an acrylic tank which may be levelled by adjusting screwed feet. ![]() The balance arm incorporates a hanger for the weights supplied and an adjustable counterbalance. This means that when the quadrant is immersed, the only force that gives rise to a moment about the knife edges is the hydrostatic force acting on the end face of the quadrant. The knife edges coincide with the centre of the arc of the quadrant. ![]() The Hydrostatic Pressure accessory has been designed to determine the static thrust exerted by a fluid on a submerged surface and enables comparison of the measured magnitude and position of this force with simple theory.Ī fabricated quadrant is mounted on a balance arm which pivots on knife edges. ![]()
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