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Re: [Phys-l] buoyancy on a submerged pole



Which brings up two more questions: see below


1) This may sound silly, but what is your definition of submerged?
As it may have bearing on how I evaluate your statement below.

Underwater


Does underwater mean:

a) all exterior surfaces of the object are in direct contact with fluid in which the object is submerged?

b) no portion of the exterior surfaces of the object are above the "top" surface of the fluid in which it is submerged; however some of the surfaces may not be in contact with fluid. (For example, an object lying on the bottom of an aquarium that is filled with a fluid.

These two situations might have to be analyzed differently depending on the answer to question (2) below and its follow-up questions.


2) What is the agent of the UPWARD force to which you refer?
(I'm assuming we are analyzing the situation in a "Newtonian"
inertial reference frame.)

Pseudo Forces don't have agents, they are free-agents!


The reason why I stipulated an inertial reference frame was that I am under the belief that in a Newtonian analysis of a situation (free body diagrams for example) one does *not* include Pseudo Forces. So are you suggesting

a) that I should not include a buoyant force in a FBD analysis of this submerged object because it is a pseudo force?

or

b) that it is incorrect to *not* include pseudo forces in such an inertial frame analysis. Which is to say I should include pseudo forces in such an analysis?

or

c) I've missed your point, in which case can you explain further?