Direction of Moment: Is Book Correct?

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Homework Help Overview

The discussion revolves around the direction of moments generated by forces F1 and F2 in a given diagram, with a specific focus on whether the moments should point into the paper and rotate clockwise, as suggested by the original poster. There is a reference to a textbook that presents a different interpretation of the moment directions.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster questions the correctness of their understanding of moment direction based on the right-hand rule and the textbook's depiction. Some participants seek clarification on the diagrams referenced and whether they accurately represent the forces in question.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the diagrams and the application of the right-hand rule. There is a suggestion that the original poster may be misinterpreting the 3D representation of the forces and moments.

Contextual Notes

Participants note potential confusion arising from the 3D drawing conventions used in the textbook, which may affect the interpretation of the moment directions.

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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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The Attempt at a Solution

 

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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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