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Statics question (is this possible?)

  1. Mar 9, 2016 #1
    1. The problem statement, all variables and given/known data
    upload_2016-3-9_3-26-45.png
    2. Relevant equations


    3. The attempt at a solution
    for part b, where the angle is 45 degrees.

    upload_2016-3-9_3-26-59.png

    would this mean that if you unpin the frame at point A, it would stay completely stationary (assuming the frame is massless)?
     
    Last edited: Mar 9, 2016
  2. jcsd
  3. Mar 9, 2016 #2

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    Yes (frame weightless ?)

    What's the attachment for ?
     
  4. Mar 9, 2016 #3
    Whoops, attachments were added by mistake.

    But very interesting to know that it would be stationary. Very hard to imagine it because it is impractical.
     
  5. Mar 9, 2016 #4

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    Impractical in the sense that it isn't a stable equilibrium, but yes: a normal force ##20\;{1\over 2} \sqrt2## at E balances the load forces.

    Again, the frame weight should be zero or else the weight will make it go downhill mucho quicko !
     
  6. Mar 9, 2016 #5
    Yes, I spent a good minute wondering how the frame would stay stationary on a roller, on a slope because the question didn't mention the frame was massless.
     
  7. Mar 9, 2016 #6

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    As long as they don 't mention the frame mass you should be OK. Witness the book solution (or is it yours?).
     
  8. Mar 9, 2016 #7
    I posted the textbook solution.
     
  9. Mar 9, 2016 #8

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    :smile: I kind of knew that. The (my) humour is in the sleek way you evade the PF rule that an attempt at solution is required. Never mind. You have a very sensible question about a not so sensible exercise. Time to move on to the next one !
     
  10. Mar 9, 2016 #9
    haha, yeah, sorry, I should have posted my attempt but figured the textbook solution was much easier to read and my question was conceptual instead of asking if I had the right answer.
     
  11. Mar 9, 2016 #10

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    All understood, clear and fine. Time to move on to the next exercise !
     
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