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Determining maximum force

  • Thread starter Ry122
  • Start date
565
2
The maximum tensions that FB and FC can undergo are 5kN and 5.5kN respectively.
Determine the maximum force of FA that can be reached without exceeding these limits.
http://users.on.net/~rohanlal/Q1.jpg [Broken]

This is all i have so far
0 = -FA + FBsin40
What's the next step?
 
Last edited by a moderator:

Answers and Replies

458
0
Calculate the components of F_B. Use this to solve for the difference between F_B and F_C to calculate F_A.
 
565
2
wouldnt u just calculate the x component since FC has no y component?
 
Last edited:
565
2
Is this answer correct:
5sin40=3.2139kN
To determine tension in FC
5cos40=3.830kN
3.830kN does not exceed the maximum limit for FC therefore the maximum force of FA is 3.2139kN.
 
458
0
You already have the tension in F_C. The rope, F_A, is not straight down. The sum of the forces in the x-direction must be zero, and the sum of the forces in the y-direction must be zero.
 
565
2
5.5kN is not the tension in FC it is the maximum limit.
 
458
0
It is the maximum limit of the tension in F_C and you want to find the maximum limit of the tension in F_A.
 
565
2
But if FC was to have a tension of 5.5kN that would put greater tension on FB. Therefore you would have to lower FB's y component to compensate for the increase of the x component to not let the tension in FB exceed the max limit.
 
23
0
I think in this case Fc does not have vertical component, so we need not to care about it. the diagram try to fool us i think. so FA(max)=FB(max)=5kN.
 

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