I Need Help with Archimedes Priniciple and Bouyant Force

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    Archimedes Force
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Homework Help Overview

The discussion revolves around Archimedes' principle and buoyant force, specifically how to determine whether an object will float or sink in water. Participants explore the relationship between the weight of an object, the buoyant force acting on it, and the density of the object compared to the fluid.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants express uncertainty about the criteria for floating versus sinking, with some questioning how to assess buoyancy beyond visual inspection. Others share calculations related to buoyant force and weight, seeking clarity on the implications of these values.

Discussion Status

Some participants have provided insights into Archimedes' principle and the concept of apparent weight, while others continue to seek clarification on the fundamental concepts involved. There is an ongoing exploration of how density influences buoyancy, with various interpretations being discussed.

Contextual Notes

Some participants mention a lack of specific problems and express general confusion about the topic, indicating a need for more detailed examples or explanations. There is also a reference to forum rules encouraging detailed problem descriptions and attempts.

AB240sx
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How do you Determine whether it floats or not
I know how to find the apparent force but how much force does it take to float above water and submergered but not sunken
 
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AB240sx said:
How do you Determine whether it floats or not
I know how to find the apparent force but how much force does it take to float above water and submergered but not sunken
As per forum rules, please post your specific problem, your attempted work so far, and details of where/how you're struggling. We'll be happy to help you with that. :)
 
Its not a specific problem but just in general i don't know how you can tell besides looking at it
i'll find an example and post it i guess
 
A cubic dm of aluminum is submerged in water. the density of aluminum is 2.70 X 10^3 kg/m^3

F buoyant is 9.80 N
F g is 26.5 N
26.5-9.8= 16.7 N
F apparent is 16.7 N

how can you tell if it floats or not, I'm sure the answer is simple, but I'm not the brightest crayon in the box
 
Last edited:
AB240sx said:
A cubic dm of aluminum is submerged in water. the density of aluminum is 2.70 X 10^3 kg/m^3

F buoyant is 9.80 N
F g is 26.5 N
26.5-9.8= 16.7 N
F apparent is 16.7 N

how can you tell if it floats or not, I'm sure the answer is simple, but I'm not the brightest crayon in the box
Archimedes principle states that the buoyant force is equal to the weight of dsiplaced fluid. The maximum possible buoyant force is when the object is completely submerged. If the object has a volume V, then if it weighs less than the same volume V of fluid, it will float. If it weighs more than the same volume of fluid it will sink. If it weighs the same as an equal volume of fluid it is neutrally buoyant and will stay at any level it is placed in the fluid.

The "apparent weight" calculation is the difference between weight and the maximum possible buoyant force. If that is positive, as it is in your example, the object will sink. If it is negative the object will float.

When an object floats on a liquid, it only displaces the amount of liquid that weighs the same as the object. If it displaces more than that (because it was dropped in the fluid or is pushed down) it will bob up and down until the final level is reached.

You can tell if an object will float by comparing its density to the density of the fluid. If an object is more dense than the fluid, then it will weigh more than an equal volume of fluid and it will sink. If it is less dense, it will float.
 
thanks that makes much more sense than my book
 

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