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brinethery
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Sorry, I meant to title it "Basic statics question on bending moment equation." Oh well.
Problem F7-7
http://www.scribd.com/doc/94480961/Chapter-7-Fundamental-Problems [Broken]
Summation of the forces in y, summation of the moments
I calculated the reaction at A, then found the shear force equation.
ƩF_y = 0 = Ay - 6kN , so Ay = 6 kN
The answer to the moment equation is supposed to be:
ƩM = 0 = M + 18 -6x
So M = 6x -18
I am particularly interested in why the M is positive in the beginning part of the moment equation. If someone could provide an explanation of the part along with a picture of the free-body diagram that's needed to make the moment equation, that would help out a lot. I am trying to understand chapter 7 but the more I read, the more confused I become.
Homework Statement
Problem F7-7
http://www.scribd.com/doc/94480961/Chapter-7-Fundamental-Problems [Broken]
Homework Equations
Summation of the forces in y, summation of the moments
The Attempt at a Solution
I calculated the reaction at A, then found the shear force equation.
ƩF_y = 0 = Ay - 6kN , so Ay = 6 kN
The answer to the moment equation is supposed to be:
ƩM = 0 = M + 18 -6x
So M = 6x -18
I am particularly interested in why the M is positive in the beginning part of the moment equation. If someone could provide an explanation of the part along with a picture of the free-body diagram that's needed to make the moment equation, that would help out a lot. I am trying to understand chapter 7 but the more I read, the more confused I become.
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