My Math Forum Question in moment of force

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 November 10th, 2011, 05:06 AM #1 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 Question in moment of force I find moment of Q correct but moment of p is not correct please I want your help.
 November 10th, 2011, 11:29 AM #2 Senior Member   Joined: Oct 2011 From: Belgium Posts: 522 Thanks: 0 Re: Question in moment of force MQ=15N*8m=120Nm
 November 11th, 2011, 12:26 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,753 Thanks: 2136 The moment about Q = -15N*8m*cot(45°) = -120Nm (or -120J if you like).
 November 11th, 2011, 12:29 PM #4 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 Re: Question in moment of force Yes ... but what is moment of p ... here I face the problem
 November 11th, 2011, 12:35 PM #5 Global Moderator   Joined: Dec 2006 Posts: 20,753 Thanks: 2136 The moment [color=red]about[/color] P = 25N(8m) - 20N(8m) - 15N(8m) = -80Nm (or -80J if you like). By the way, you annotated the diagram with Q at the bottom right, but Q was already in use at the top left.
 November 11th, 2011, 12:43 PM #6 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 Re: Question in moment of force In fact I don't understand clearly how you got that answer. I think -20(0) because it return to Q force ... can explain to me each force by diagram please for moment of P ..
 November 12th, 2011, 08:36 AM #7 Global Moderator   Joined: Dec 2006 Posts: 20,753 Thanks: 2136 Since each force has a unique magnitude, you can tell which force each term refers to. Each force is multiplied by the appropriate distance, measured perpendicular to the direction of the force, and these distances are shown in the diagram (or an easy consequence of what is shown).

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# moment of force question

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