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Engineering Mechanics Couple system question 
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#1
May2605, 09:16 PM

P: 23

what is this problem searching for?
A 25lb force acting in a vertical plane parallel to the yz plane is applied to the 8in.long horizontal handle AB of a socket wrench. Replace the force with an equivalent forcecouple system at the origin O of the coordinate system. See attached pic of the problem. AO is 15in.long vertical AB is 30 degrees off the xaxis Force(in red) is 25lb and is 20 degrees from the zaxis  ok tell me if I"m wrong. I think this problem is looking for the force that should be applied to cancel the other force but still have the same moment about O. Please tell me if I'm thinking correctly... however, how should I go about doing that? if that is the solution to this problem. 


#2
May2705, 06:51 AM

Sci Advisor
P: 5,095




#3
May2705, 12:45 PM

P: 23

ok, I think I get it.....please correct me if I'm wrong (and let me know if I'm right)...
First I add vectors that are equal to F and F at point O. then I find the couple produced by F (original force) and F. That will give me the answer of the couple moment at point O. and then I have F applied at O left over. Is that what it is looking for? I calculated the following answers: M = 196.94i + 352.35j  128.25k F = 8.55j + 23.49k 


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