What is the magnitude of force vector?

  • Thread starter ozzolins
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  • #1
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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.
 

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  • #2
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[itex]F_r = F_1 + F_2[/itex]

Does this help you?

The resultant force is the sum of all forces.
 
  • #3
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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.
 
  • #4
SteamKing
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Well, what's stopping you from finding the components?
 
  • #5
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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.
 
  • #6
SteamKing
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Fr = 58.264 N
I don't know where you got 199.9 N

And you could stand an algebra refresher.
 
  • #7
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Fr = 58.264 N
I don't know where you got 199.9 N

And you could stand an algebra refresher.

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?
 
  • #8
SteamKing
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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.
 
  • #9
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Now the diagram is correct. Still can't figure out magnitude of F2.
 
  • #10
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Now the diagram is correct. Still can't figure out magnitude of F2.
It seems to me that you're not even trying. Show us what you've done to find ##F_2##, show us your work.
 
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  • #11
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Now the diagram is correct. Still can't figure out magnitude of F2.
If you call f2 the magnitude of F2, what are its components in the x and y directions (in terms of f2)?

Chet
 
  • #12
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Now the diagram is correct. Still can't figure out magnitude of F2.
Is this your diagram, or is from some book / web site? What's with that 3-4-5 triangle?
 

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