Proving F2 and F1: The Only Possibilities

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Homework Help Overview

The discussion revolves around the forces F1 and F2 in a fluid mechanics context, specifically related to pressure and area. The original poster seeks to prove that F2 equals P2(deltaA)(-j hat) and F1 equals P1(deltaA)(+j hat), asserting these as the only possibilities.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need for a visual representation of the problem and clarify the setup involving a plane in water. There are inquiries about the relationship between force and pressure, and attempts to articulate the forces acting on the plane.

Discussion Status

The discussion is ongoing, with participants providing clarifications and seeking additional information. Some have suggested that understanding the relationship between force and pressure is key to addressing the problem, while others are still looking for a clearer depiction of the scenario.

Contextual Notes

There is mention of the absence of acceleration in the system, which may influence the interpretation of the forces involved. Additionally, participants are encouraged to complete the homework template sections that are currently missing.

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Homework Statement



Why must F2=P2(deltaA)(-j hat) and the opposing force be F1=P1(deltaA)(+j hat). Prove that these are the only two possibilities that are true.



Homework Equations





The Attempt at a Solution

 
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klezzie13 said:

Why must F2=P2(deltaA)(-j hat) and the opposing force be F1=P1(deltaA)(+j hat). Prove that these are the only two possibilities that are true.

Could you provide the picture of the situation please? Or at least describe the situation with words.
 
Welcome to PF klezzie13. In addition to explaining the problem better, you'll need to complete the Relevant equations and attempt at a solution portions of the homework template.

klezzie13 said:

Homework Equations





The Attempt at a Solution

 
you have a plane inside of a container of water. On the plane there is the force of gravity pointing downward. F2 must point downward and F1 must point upward. There is no acceleration within the system. F1,2≈ P1,2ΔA. Does that help?
 
I think we need to see the figure.
 
here it is. Its pretty simplistic but hopefully you get the point.
 

Attachments

Okay. What equation do you know that relates force and pressure?
 
F/A=p
F=Ap

I think I figured it out
 
Yup, looks like you probably have :smile:
 

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