Statics forces acting on supports

  • Thread starter jimbo71
  • Start date
1. The problem statement, all variables and given/known data
see attachement


2. Relevant equations
sum of Fx=0
sum of Fy=0
sum of M=0


3. The attempt at a solution
There are 4 forces that I have found. 12W acting in the negative y direction at A. 3W acting in the negative direction acting 2 feet from pt B. A F acting in the positive y direction from point A and a F acting in the positive direction from point B.
Ay+By-12W-3W=0.
Ay+By=3036lb/ft

Obviously I need a second equation to solve for Ay and By. I'm not sure what other forces I can sum up. I think somehow I want to incorporate a moment force but I don't know what it would be.
 

Attachments

?????
 

tiny-tim

Science Advisor
Homework Helper
25,789
242
Hi jimbo71! :smile:

I can't see your diagram yet, so I'm only guessing …

but there's probably no "moment force" - you just choose a point, and take moments of all the ordinary forces about that point, and equate it to zero. :wink:
 

Want to reply to this thread?

"Statics forces acting on supports" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top