Direction of Moment: Is Book Correct?

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The discussion centers on the direction of moments created by forces F1 and F2 in a specific diagram, with a participant asserting that the moments should point inward and rotate clockwise. However, there is confusion regarding the interpretation of the diagram, as others note that the forces could also be directed outward, depending on the 3D perspective. The right-hand rule is referenced to determine the direction of the moment, indicating that the thumb should point into the paper. Clarification is needed on the 3D drawing conventions used in the book to resolve the discrepancies. Ultimately, understanding the correct application of the right-hand rule and the diagram's orientation is crucial for determining the accurate moment direction.
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Homework Statement


IMO, the direction of moment of both F1 and F2 should point inside the paper , and rotate clockwise , am i right ? but the book gave different things... which is correct?

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Please describe how you arrived at your answer.
Note, the images you provide do not appear to have F1 or F2 on them... fig 3.26a has some forces and a moment, it that what you mean?
 
Simon Bridge said:
Please describe how you arrived at your answer.
Note, the images you provide do not appear to have F1 or F2 on them... fig 3.26a has some forces and a moment, it that what you mean?
there are f1 anf f2 in diagram 3.26a and 3.26b ... sinnce the moment = r X F... so, by right hand rule , the thumb( direction of moment )_ point into the paper...and the moment should be in clockwise direction... am i right ?
 
It's an optical illusion. You're seeing r1 and r2 coming out of the page. They can also be going into the page.
 
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Make sure you have the 3d drawing convention for thr book right.
 

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