Finding an Equivalent Couple for the Forces in the Figure

AI Thread Summary
The discussion revolves around a homework problem involving the replacement of a couple with an equivalent couple at specified points A and B. The key equation for calculating the moment of a couple is M = Fd, where F is the force and d is the distance between the forces. Participants express confusion over the question's clarity and the high point value of 6 marks, suggesting it may be poorly worded. One interpretation suggests that the problem requires finding a pair of opposite parallel forces through points A and B, potentially at any angle, maintaining the same moment. Overall, the discussion highlights the need for clearer problem statements in physics assignments.
mehsham
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Homework Statement



The forces shown in the Figure below form a couple. Replace the couple shown with an equivalent couple acting at points A and B. Please see figure

Homework Equations



Couple force moment equation is M = Fd (take only one of the two force vectors and distance between them)

The Attempt at a Solution



Actually, I don't understand what they want. I was just going to do M = 15 lb x(12in) but this question is for 6 marks so I'm definitely missing something. Please advice if you know what this question means.

Thank you,
Faisal Shibli
 

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Welcome to PF!

Hi Faisal! Welcome to PF! :smile:
mehsham said:
The forces shown in the Figure below form a couple. Replace the couple shown with an equivalent couple acting at points A and B. Please see figure
…
… this question is for 6 marks so I'm definitely missing something. Please advice if you know what this question means.

The 6 marks do seem strange. :confused:

The question seems to be asking for a pair of opposite parallel forces through A and B …

which could be at any angle …

with the same Fd.
 
Looks to me like a badly worded and badly drawn question. My response was to have a couple at A and B with forces perpendicular to AB. I wonder if I would have passed.
 

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