Why Does the Solution Use FH(6) Instead of FH(10) for Gate Force Calculation?

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Homework Help Overview

The problem involves calculating the force on a gate due to seawater pressure and a horizontal force exerted by a wall. The original poster questions the use of FH(6) instead of FH(10) in the calculations provided in a sample answer.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to clarify the reasoning behind the choice of FH(6) over FH(10), suggesting that FH(10) seems more appropriate given the distance from the hinge to the wall. Other participants engage by questioning the direction of FH and its implications for calculating moments.

Discussion Status

The discussion is ongoing, with participants exploring the reasoning behind the force calculations and the direction of forces involved. Some guidance is provided regarding the direction of FH, but no consensus has been reached on the correct distance to use in the calculations.

Contextual Notes

Participants are working within the constraints of the problem statement and the sample answer provided, which may not fully clarify the assumptions made regarding the forces and distances involved.

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Homework Statement


the gate is 3m wide , is hinged at point A , and rests against a smooth wall at B . Calculate the force on the gate due to seawater pressure and horizontal force exerted by wall at B . I have attached the sample answer below . I don't understand why the author use FH(6 ) instead of FH(10)
HmiBciz.png

1CaoYN8.png


Homework Equations

The Attempt at a Solution


IMO , it should be FH(10) , am i right ? 10 is the distance from A to B
 

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In what direction does FH act?
 
haruspex said:
In what direction does FH act?
Horizontal
 
foo9008 said:
Horizontal
Right, so how do you find its moment about A?
 
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Ok, I forgot it's horizontal force
 

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