Upthrust vs Weight: Object Immersion in Fluids

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SUMMARY

The discussion centers on the principles of buoyancy, specifically the relationship between weight and upthrust (buoyancy) for objects immersed in fluids. When an object's weight exceeds the upthrust, it sinks; when the weight is less, it floats. If the weight equals the upthrust, the object achieves neutral buoyancy, remaining suspended in the fluid without sinking or floating. This concept is crucial in understanding fluid dynamics and object behavior in various mediums.

PREREQUISITES
  • Understanding of buoyancy concepts, including positive, negative, and neutral buoyancy.
  • Familiarity with fluid dynamics principles.
  • Basic knowledge of weight and force interactions in physics.
  • Awareness of the implications of object density in fluids.
NEXT STEPS
  • Research the principles of Archimedes' principle and its applications in fluid mechanics.
  • Explore the mathematical equations governing buoyancy and fluid resistance.
  • Learn about the applications of neutral buoyancy in underwater vehicles and diving.
  • Investigate the effects of fluid density variations on buoyancy in different environments.
USEFUL FOR

This discussion is beneficial for physics students, engineers working with fluid systems, and anyone interested in the principles of buoyancy and object behavior in fluids.

MBBphys
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Homework Statement


Object immersed in fluid.
If weight larger than upthrust, it sinks. If less, it floats. If weight equal to upthrust, it floats, right?
Thanks!

Homework Equations


N/A

The Attempt at a Solution


N/A
 
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That would constitute neutral buoyancy. In reality it could never quite happen (unless the object is a notional parcel of the fluid itself). It would not properly be described as either floating or sinking. It would just stay wherever it is put, as long as it is fully immersed. It could be touching the surface, touching the floor, or anywhere in between.
 
MBBphys said:

Homework Statement


Object immersed in fluid.
If weight larger than upthrust, it sinks. If less, it floats. If weight equal to upthrust, it floats, right?
Thanks!

Homework Equations


N/A

The Attempt at a Solution


N/A
If by 'upthrust' you mean buoyancy, the terms 'positive buoyancy', 'negative buoyancy', and 'neutral buoyancy' have specific meanings in this context.

https://en.wikipedia.org/wiki/Neutral_buoyancy
 

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