Why are F2 and F1 the only possible pressure forces on a surface?

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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?
 
here it is. Its pretty simplistic but hopefully you get the point.
 

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