Find the moment caused by all the forces

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SUMMARY

The discussion focuses on calculating the distance \( d \) required for the resultant couple to be zero in a frame acted upon by two couples. The participants clarify that the moment of a couple remains constant regardless of the point chosen for calculation. The correct approach involves applying the formula \( \text{moment} = f \cdot d \) for each couple independently to determine the necessary distance \( d \), which is concluded to be 1.8 meters.

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  • Proficiency in applying the formula \( \text{moment} = f \cdot d \)
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Homework Statement



two couples are acting on the frame. If the resultant couple is to be zero, find the distance d

Homework Equations





The Attempt at a Solution


First find the point, Let's say A on the picture, and find the moment caused by all the forces
500cos30 x 0.9 acting downward, 500cos30 x (0.9+d) acting upward, moments by 750ns are cancelled, at least that was what i thinking but i don't think this is right method to use..
is moment by couple = f.d ?
so d = 1.8m?
i don't get this...
Please help me TT
 

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Hi 385sk117! :smile:
385sk117 said:
two couples are acting on the frame. If the resultant couple is to be zero, find the distance d
…
First find the point, Let's say A on the picture, and find the moment caused by all the forces
…

No, you don't need to choose a point …

the moment of a couple is the same about any point.

So just use your f.d formula for each couple separately. :wink:
 


Thankyou :)
 

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