Explain when will upthrust change?

Click For Summary

Discussion Overview

The discussion revolves around the conditions under which upthrust (buoyant force) changes when objects of varying densities are placed in different fluids. Participants explore theoretical aspects of buoyancy, including the influence of fluid density and object weight on upthrust.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the conditions under which upthrust changes, referencing conflicting information about objects of different densities and materials in the same fluid.
  • Another participant states that upthrust is determined by the weight of the fluid displaced, which depends on the object's volume and the fluid's density.
  • A participant inquires whether the weight of an object affects upthrust, specifically asking about the difference in upthrust when the same object is placed in fresh water versus sea water.
  • It is asserted that the weight of the object does not affect upthrust, emphasizing that upthrust is influenced by the volume of fluid displaced and the fluid's density.
  • One participant reiterates the question about the upthrust in fresh water versus sea water, suggesting that the upthrust would not be the same due to the change in fluid density.

Areas of Agreement / Disagreement

Participants express differing views on the role of object weight in determining upthrust and whether upthrust remains constant when changing fluids of different densities. The discussion does not reach a consensus on these points.

Contextual Notes

Participants reference various conditions and definitions related to buoyancy and upthrust, highlighting potential misunderstandings about the relationship between object weight, fluid density, and upthrust.

starwars32
Messages
17
Reaction score
0
Hi.. Can someone explain when will upthrust change? cos i come across books saying that upthrust will not change when two objects of different density but same material are placed in the same fluid. I also come across that upthrust will not change when same objects are being transferred from liquid a of different density to liquid b of another density, the upthrust also will remain same. Can some one pls explain to me when and when will upthrust not change? Under wad conditions thanks!
 
Physics news on Phys.org


The upthrust is equal to weight of the fliud the object displaces - so it depends on the size (volume) of the object and the density of the fluid - that's all
 


then does weight of an object plays a part? Next, if let's say for the same object, we put in fresh water of Density 1, we have an upthrust of U, if we put this object in sea water of Density 2, will we have a simliar upthrust?
 
Last edited:


The weight of the object doesn;t affect upthrust, they are 2 different forces. And no upthrust will not be the same because the density of the fluid changed.

As said in the previous post, it's the volume of the object (i.e. the amount of fluid displaced) and the density that matters.
 


starwars32 said:
then does weight of an object plays a part? Next, if let's say for the same object, we put in fresh water of Density 1, we have an upthrust of U, if we put this object in sea water of Density 2, will we have a simliar upthrust?

The upthrust is normally defined as just the upward buoyancy force - the overall buoyancy, or apparent weight, will depend on the upthrust and weight.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 9 ·
Replies
9
Views
18K
  • · Replies 14 ·
Replies
14
Views
8K
  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 5 ·
Replies
5
Views
9K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 22 ·
Replies
22
Views
1K
  • · Replies 48 ·
2
Replies
48
Views
3K
  • · Replies 4 ·
Replies
4
Views
844