Statics Question / Understanding Direction

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To determine the sign of a couple in statics, it's essential to analyze the direction of the moment it creates. In the discussed example, the 30 lb couple generates a clockwise moment in the z-y plane, resulting in a negative moment value. The Right Hand Rule (RHR) is used to establish this sign; the thumb should point perpendicular to the z-y plane to maintain consistency with the moment's direction. Proper orientation of the hand is crucial for accurate sign determination. Understanding these principles is key to solving problems involving couples in statics.
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Homework Statement



I'm trying to understand how to determine the sign (+/-) of a given couple. In the sample problem below it shows the 30 lb couple (on the zy-plane) having a negative value for it's force. Is this found by using the RHR? And if so, in which direction do I orient my hand? In the positive direction of the axis it's parallel to?

C3kmH.jpg


Homework Equations



M = Fd

Right Hand Rule

The Attempt at a Solution



I tried to depict the two orientations inside of the picture above.

Thank you for any help / feedback is appreciated.
 
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I think you meant to say that it has a negative value for its moment? If you look at the couple you'll see that it causes a clockwise moment in the z-y plane which means it causes a negative moment in the z-y plane. This means that your thumb should be perpendicular to the z-y plane in order for the RHR to be obeyed and keep the same sign of the moment created.
 

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