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Buoyancy Force


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I'm stuck with how to find the buoyancy force on an object.

 

I know how to find density but I can't find it in my textbook how to find the buoyancy force.

 

 

Could someone help with the general idea of finding the buoyancy force? I don't need the answer, just what equation I should be using for this.

 

Thanks. :)

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there are two ways of doing this

 

1/ you can do a differential force balance by considering the geometry of the object and the respective depths(this is only practical for simple shapes as it can get very complicated very quickly)

 

2/ you work out the mass of water displaced by the object. the weight of this displaced water will be equal to the buoyancy force.

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