1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is the magnitude of force vector?

  1. Sep 8, 2013 #1
    1. Determine the magnitude of F2

    attachment.php?attachmentid=61582&stc=1&d=1378674322.jpg


    2. How can I find this one force if I know resultant force and other force? Never done this before, that's why I've no idea.



    3. Sorry, I have none.
     

    Attached Files:

    Last edited: Sep 8, 2013
  2. jcsd
  3. Sep 8, 2013 #2
    [itex]F_r = F_1 + F_2[/itex]

    Does this help you?

    The resultant force is the sum of all forces.
     
  4. Sep 8, 2013 #3
    I know that, but it's a bit more complicated due to the fact that for these forces I need to find x and y components first.
     
  5. Sep 8, 2013 #4

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Well, what's stopping you from finding the components?
     
  6. Sep 8, 2013 #5
    Unknown F2 value.

    I came down to:

    199.9 = √(0.6x+86.6)2 + (0.8x + 50)2

    Though, I can't (don't know how) solve this equations.


    NB! I made a mistake and resultant force is 199.9 N.
     
  7. Sep 8, 2013 #6

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Fr = 58.264 N
    I don't know where you got 199.9 N

    And you could stand an algebra refresher.
     
  8. Sep 8, 2013 #7

    Why do you think it's 58.264N? I made a mistake writing it down in the first post.

    This is only part of exercise.

    There was resultant moment given of 115 N*m, and distance between Fr and point O (where this moment happens) was 0.575 meters. So I divided 115 by 0.575m and I got resultant force of 199.9N.

    Now I need to find F2.

    Anyone can help with that, please?
     
  9. Sep 8, 2013 #8

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    I'm sorry. The OP had a diagram asking to determine the magnitude of F2. If you want to post the correct problem you are working on, please do so.
     
  10. Sep 8, 2013 #9
    Now the diagram is correct. Still can't figure out magnitude of F2.
     
  11. Sep 9, 2013 #10
    It seems to me that you're not even trying. Show us what you've done to find ##F_2##, show us your work.
     
    Last edited: Sep 9, 2013
  12. Sep 9, 2013 #11
    If you call f2 the magnitude of F2, what are its components in the x and y directions (in terms of f2)?

    Chet
     
  13. Sep 9, 2013 #12

    D H

    User Avatar
    Staff Emeritus
    Science Advisor

    Is this your diagram, or is from some book / web site? What's with that 3-4-5 triangle?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: What is the magnitude of force vector?
Loading...