Date: Thu, 2 Dec 2004 17:38:32 -0500

Author: Wolfgang Rueckner

Subject: buoyancy


I have a conceptual question pertaining to buoyancy in an accelerated
frame (for example, Dick Berg's demo found under
I understand the argument why the buoyant force of a floating object
increases by the same amount the the object's weight increases in the
accelerated frame, and therefore the object doesn't float any
differently than when it's sitting still. My problem is visualizing
the mechanism of what's going on to accelerate the floating object.
The container of fluid is accelerated by some outside force and that
force has to be communicated to the floating object by the liquid it's
floating in so that it too accelerates by the same amount. But the
only force of the liquid on the object is the buoyant force. So
doesn't the buoyant force have to be a little different from the
apparent weight of the floating object to produce an acceleration?
Where is my thinking hanging up? -- Wolfgang
From Thu Dec 2 17:39:19 2004