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Direction of concurrent forces

  1. Oct 19, 2015 #1
    1. The problem statement, all variables and given/known data
    Which is the correct diagram for concurrent forces? The left or the right one ?

    2. Relevant equations


    3. The attempt at a solution
     

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  3. Oct 19, 2015 #2

    BvU

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    Both diagrams are identical.
     
  4. Oct 19, 2015 #3
    no , one is all the forces acted towards the circle , the another one is forces away from the circle..Which is the correct diagram for concurrent forces?
     
  5. Oct 19, 2015 #4

    BvU

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    Ah, so there is a context.
    My answer was based on the idea that a force can be moved along its line of action.
    Apparently the circle represents something that can be deformed so that the above rule doesn't apply any more ?
     
  6. Oct 19, 2015 #5
    assuming they are the similar circle , no deformation occur (rigid body)Which is the correct diagram for concurrent forces?
     
  7. Oct 19, 2015 #6

    BvU

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    Sorry, I still don't get what this is about. What are concurrent forces ? And what would those forces be if they were not concurrent ? Countercurrent ? Cooperative ?
     
  8. Oct 19, 2015 #7

    BvU

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    Ah ! Google to the rescue. Concurrent means the lines of actions are going through one single point
     
  9. Oct 19, 2015 #8

    BvU

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    Really a good source, this google search: both pictures are concurrent forces. One is compressive.

    See here (simple google!)
     
  10. Oct 19, 2015 #9

    BvU

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    And now that we know what we are looking for: the inwards or outwards isn't the deciding factor. Protract the force lines and see if they go through one single point.

    For experts only: the problem statement is incomplete if it doesn't state that the forces shown are coplanar !
     
  11. Oct 19, 2015 #10

    BvU

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    I like to be liked, but I like it even better when a student understands. Was this a homework exercise where you reconstructed the original picture and you now know which feature is the one that requires the most attention ?

    And now that I know you can post a drawing :smile: -- how are we doing with the torque equilibrium exercise ?
     
  12. Oct 19, 2015 #11
    no, this is not an exercise . I just dont understand the notes given by my lecturer , and i ask here
     
  13. Oct 19, 2015 #12

    BvU

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    I see. All clear now, I hope.
     
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