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Forces on a window

  1. Oct 12, 2015 #1
    1. The problem statement, all variables and given/known data

    Draw the forces on a window

    The scenario is that I have 3 suction cups on the window to tale it down. And i dont know where the "normalforce" is. I forgot to draw the force of the suction cups
    2. Relevant equations


    3. The attempt at a solution

    z8jtzqH.jpg
     
  2. jcsd
  3. Oct 12, 2015 #2

    BvU

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    Hi,

    The suction cups must be located somewhere. Also, I find it hard to believe the Fn and Ff working lines in your sketch. Please elaborate ...
     
  4. Oct 12, 2015 #3
    Does Fn hav to be opposite of Fg?
     
  5. Oct 12, 2015 #4

    BvU

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    Opposite meaning working on the left pane if the other is working on the right pane ? Or do they grab along the same line ? Or are there more than one friction forces aat work ?

    From the picture I can't see if the window is in static equilibrium or if it's crashing down with thunderous speed (probably the former :smile:)
     
  6. Oct 12, 2015 #5
    It is not supposed to move. If I look out of my bedroom window there is a downward force (Fg) and a upward force which is the friction. The window has suction cups om the outside to try to remove the window. So there is also a force outside cus someones is pulling. So i am wondering where Fn is. It must be opposite of the pulling force right?
     
  7. Oct 12, 2015 #6

    BvU

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    Sorry to have still more questions, but I can't form a complete picture yet:

    which way is the someone outside pulling ? Can you post a more complete picture ? Is it sensible to also draw a side view, or are all forces verical ?
     
  8. Oct 12, 2015 #7
    http://imgur.com/a/p9SU3
    http://imgur.com/a/p9SU3

    Here are the pictures. Fg is down and the friction force is up. Outside there are three things stuck on thw window so they can pull it out. So i am wondering where Fn is
     
  9. Oct 12, 2015 #8

    BvU

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    Found a window picture:

    window1-detail.jpg
    If you pull on the suction cups in an outward direction, that is a horizontal force. The jambs provide the normal force . So a side view is indicated !

    Friction force is up, you say. How do you know ? And is it offsetting Fg completely ?
     
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