Determine the moment of this force

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The discussion focuses on determining the moment of a force (F = 120N) acting on a total hip replacement about two points: the neck (A) and the stem (B). Participants are encouraged to share their attempts and specific difficulties to receive targeted assistance. One user successfully calculated the moment about point A but struggles with point B due to a lack of information regarding the distance to point B. Another participant suggests using the angles provided in the diagram to find the necessary distances for the calculation. The conversation emphasizes the importance of understanding the geometry involved in solving the problem.
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Homework Statement


The total hip replacement is subjected to a force of F = 120N.
Determine the moment of this force about the neck at A and at the stem B

Homework Equations



M = r X F

The Attempt at a Solution



...
 

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So, ... where is your work?
 
Welcome to PF!

Hi yosheey ! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 


Hi! I am stuck on this problem too, is there anyone that would mind showing me how to do it? My group and I are stuck.
 
Last edited:
welcome to pf!

hi jining! welcome to pf! :smile:

(you know what I'm going to say, don't you? :wink: …)

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 


Hello! Thanks!

Um, so I managed to get the moment about a, but I don't know what to do for b

http://imgur.com/Wx939
 
hello jining! :smile:

yes, your moment about A looks fine (you drew that 5° really large … good idea! :biggrin:)

for the moment about B, do it the same way, extending that 15° line until it gets near B …

but of course you need to know how far down B is, and the question doesn't tell you :confused:
 


Yea... :| that's where I am stuck haha .. any ideas? Thanks for the help.
 
oh i see now, i wasn't looking at the diagram properly :redface: …

you can find how far that 150° point is to the right, then use the 10° to find how far down it is from there to B :wink:
 

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