Statics: Moment about an axis

  • Thread starter MienTommy
  • Start date
  • #1
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Homework Statement


Two 20 lb forces are applied to a ratchet wrench down at A and up at B to loosen bolt β. Find the sum of the moments of the two forces about the axis (x) of the bolt.

Homework Equations


What are the moments at point A, B, and Q?
How do I find the moment about the x axis and not at the bolt β?

The Attempt at a Solution


Not sure how to set up the problem because of the different pivots Q and B which are angled.


hw1.png
 

Answers and Replies

  • #2
569
85
First step: What torque is transmitted down the 8" wrench extension?
Have you studied torques as vectors?
 
  • #3
22
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Yes I believe I have, but we call them moments? Could I just find the moment on the 8" wrench extension and project it on the x axis by multiplying it by cos(45) to find the answer?
 
  • #5
22
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This is my attempt at the problem, I feel like it is wrong because of my Force vector.
 

Attachments

  • 20150907_205826.jpg
    20150907_205826.jpg
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  • #6
569
85
Unfortunately, I can open, but can't read your attachment. What is the moment in the wrench extension?
 

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