Scalar product using right hand rule ?

AI Thread Summary
The discussion centers on the use of scalar analysis, specifically the dot product, to determine the direction of a moment, which some participants argue is incorrect. They assert that only the cross product can accurately determine direction. However, others maintain that the solution presented is correct, emphasizing that a coupled moment is defined by the magnitude of a force and the perpendicular distance. The conversation also questions how the right-hand grip rule applies to scalar analysis for moments. Ultimately, clarity on the relationship between scalar and vector analysis in this context is sought.
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Homework Statement


Refer to solution II , the author used the scalar analysis( dot product) to get the direction of moment ...IMO , this is incorrect ... Only cross product can be determined this way . correct me if I'm wrong .

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No, the solution is correct. The value of a coupled moment is just equal to the magnitude of one of the forces times the perpendicular distance between them.
 
axmls said:
No, the solution is correct. The value of a coupled moment is just equal to the magnitude of one of the forces times the perpendicular distance between them.
how can the direction of moment(scalar analysis) determined using the right hand grip rule ?
 

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