My Math Forum What is the total summation of moments at A ?

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 May 26th, 2019, 01:30 AM #1 Senior Member   Joined: Aug 2014 From: India Posts: 365 Thanks: 1 What is the total summation of moments at A ? What is the total summation of moments at A? I tried $\displaystyle \sum M_{A} = F.(d+d )-F(d+d )-F.d$ I am getting negative answer.
 May 26th, 2019, 01:45 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,759 Thanks: 2138 Any force acting through A has a zero moment at A. Did you intend the leftmost force to be -F rather than F? If it's -F in the downwards direction, it's equivalent to F in the upwards direction.
May 26th, 2019, 02:22 AM   #3
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Quote:
 Originally Posted by skipjack Did you intend the leftmost force to be -F rather than F?
Leftmost force F is acting downward so -F.

 May 26th, 2019, 04:29 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,759 Thanks: 2138 The arrow shows the force is acting downward, so the magnitude would be F, not -F. Is the answer F·d intended to be correct?
June 14th, 2019, 10:53 PM   #5
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Quote:
 Originally Posted by skipjack The arrow shows the force is acting downward, so the magnitude would be F, not -F.
Are you saying my diagram is wrong?

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