- #1
Resultant and Moment Homework: Determine R & Moment about O
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Homework Help Overview
The discussion revolves around determining the resultant force (R) and the moment about point O in a physics problem. Participants are examining the methods and reasoning behind calculating these quantities, referencing images for clarity.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants discuss various attempts to find the resultant and moment, with some expressing uncertainty about the methods used. Questions arise regarding the correctness of the calculations and the application of vector operations, such as the cross product.
Discussion Status
The discussion is active, with participants providing feedback on each other's approaches. Some guidance has been offered regarding the need to consider each vector's position vector separately when calculating the moment. There is an ongoing exploration of different interpretations of the problem.
Contextual Notes
There are references to images that contain important information for the problem, which are not visible in the text. Participants are also questioning the signs of certain forces and the methods used to arrive at their conclusions.
- #2
tiny-tim
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Hi LMW - Dk! Welcome to PF! 
Show us what you've tried and where you're stuck, and then we'll know how to help!
Show us what you've tried and where you're stuck, and then we'll know how to help!
- #3
LMW - Dk
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See the pictures. I have found the moment and the resultant. However I think it's the wrong method ^^
- #4
tiny-tim
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sorry, i didn't notice your third picture 
your Fz36 should be minus 36, shouldn't it?
(btw, i think most people find it easier to use cos and sin, of angles < 90°, and then use common-sense to decide whether its + or -)
i don't understand what you did to find the moment
…
your Fz36 should be minus 36, shouldn't it?
(btw, i think most people find it easier to use cos and sin, of angles < 90°, and then use common-sense to decide whether its + or -)
i don't understand what you did to find the moment
…can you please type it out in the post?
- #5
LMW - Dk
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Well can't you tell me how you would do this problem? how would you find the resultant and the moment?
- #6
LMW - Dk
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If you click on the second picture then you can see that i have drawn a direction vector. Then i have found the cfross product of the direction vector and the resultant force.
- #7
tiny-tim
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LMW - Dk said:
ah, now i understand …
no, you've crossed the resultant with the position vector for only one of the vectors: you need to cross each vector with its own position vector, and then add (ie, there's no short-cut)
(and did the minus 36 help?)
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