 #1
TomK
 69
 14
 Homework Statement:
 Archimedes' Principle
 Relevant Equations:

upthrust = weight of fluid displaced
volume of object = volume of fluid displaced
I had some questions about Archimedes' Principle. This image shows an object being gradually submerged into fluid:
As far as I'm aware, when the object is floating, weight of fluid displaced by object = upthrust acting upwards on the object.
When the object is fully submerged, volume of the object = volume of fluid displaced.
When an object is in the sinking process (i.e. upthrust cannot keep object afloat, so object gradually falls through fluid), does only the volume rule apply, or does the upthrust/weight rule apply too?
If an object is held inplace whilst fully submerged, which rules apply? If you hold an object inplace underwater (i.e. with your hand), what do the forces on the object look like (i.e. what direction does each force act in, and which stop the object falling vertically)?
When the object has fullysunk (and has stopped moving vertically), which rules apply?
I'm guessing that upthrust is always acting on an object in fluid, no matter how much it has been submerged, but the magnitude of upthrust changes to equal the weight of fluid displaced (with upthrust being at its maximum when fully submerged). Is this right?
When an object is floating, does the volume of the partiallysubmerged section of the object equal the volume of water displaced?
Please clarify these conceptions I have. Thank you.
As far as I'm aware, when the object is floating, weight of fluid displaced by object = upthrust acting upwards on the object.
When the object is fully submerged, volume of the object = volume of fluid displaced.
When an object is in the sinking process (i.e. upthrust cannot keep object afloat, so object gradually falls through fluid), does only the volume rule apply, or does the upthrust/weight rule apply too?
If an object is held inplace whilst fully submerged, which rules apply? If you hold an object inplace underwater (i.e. with your hand), what do the forces on the object look like (i.e. what direction does each force act in, and which stop the object falling vertically)?
When the object has fullysunk (and has stopped moving vertically), which rules apply?
I'm guessing that upthrust is always acting on an object in fluid, no matter how much it has been submerged, but the magnitude of upthrust changes to equal the weight of fluid displaced (with upthrust being at its maximum when fully submerged). Is this right?
When an object is floating, does the volume of the partiallysubmerged section of the object equal the volume of water displaced?
Please clarify these conceptions I have. Thank you.