Calculating Total Moment of Force F1 about Point A

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Homework Help Overview

The discussion revolves around calculating the total moment created by force F1 about point A, involving concepts from mechanics and the application of moment equations.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculation of the moment using the formula involving perpendicular distance and force. The original poster attempts to compute the resultant distance but encounters difficulties. Others suggest using angles and perpendiculars to clarify the setup and find the necessary lengths.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the geometric relationships involved, but no consensus has been reached on the approach to find the angle theta or the necessary lengths.

Contextual Notes

There is mention of a drawing that may provide additional context, and participants are considering the geometry of the situation, including the placement of points and angles involved in the moment calculation.

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Homework Statement


http://i.imgur.com/Laub8lL.png
Find the total moment created by force F1 about point A.

Homework Equations


moment = perpendicular distance x force


The Attempt at a Solution


I got my resultant distance to be squrt(20). With this in mind, I plugged into my calculator:
sqrt(20) x 12 x (insert values listed below)
(numbers in degrees)
cos(35)
sin(35)
cos(55)
sin(55)

and I've had no luck with any of this.

Please help me
 
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The moment is
FL sin(θ)
where θ is the angle between the line connecting point A and the point where F acts on the structure and the line of action of the force
 
How do i find theta though?
 
See drawing
 

Attachments

  • moment.jpg
    moment.jpg
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Call the point where the right-angled bend is B.
Drop a perpendicular from B to the line of the force. What's the length of it?
Drop another from B to a line through A parallel to the force. What's the length of that?
 

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