Momentums, Ladder against a wall force

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The discussion revolves around solving a physics problem related to moments and forces involving a uniform ladder. The original poster expresses confusion over how to approach the problem, particularly regarding the center of gravity and the unknown location of point W. Participants clarify that the question specifies taking moments about point Y and emphasize that W, being on a uniform ladder, is located at its midpoint. This understanding simplifies the calculations needed to find the necessary distances for solving the problem. Overall, the key takeaway is that recognizing the uniformity of the ladder is crucial for determining the position of W.
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Homework Statement



http://www.physics.ox.ac.uk/olympiad/Downloads/PastPapers/BPhO_PC_2008_QP.pdf

Question 6

Homework Equations



Moment = Force * Distance moved

The Attempt at a Solution



I have tried this and I am sorry to say that I have no idea how to work it out. I think it is something to do with moments but the centre of gravity is not about a pivot so I don't if I should still reference Y from W. Furthermore, since the exact location of W is not known, I can't just use pythagoras to find the distance of Y from W.

Any help would be great, thank you very much.
 
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Hi Mukilab! :smile:
Mukilab said:
I think it is something to do with moments but the centre of gravity is not about a pivot so I don't if I should still reference Y from W.

uhh? :confused: The question tells you to take moments about Y.

Get on with it!
Furthermore, since the exact location of W is not known, I can't just use pythagoras to find the distance of Y from W.

Read the question … it's a "uniform ladder", meaning that it's the same all the way along …

so W will be in the middle! :wink:​
 
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