Which force creates the torque?

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EastWindBreaks
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Homework Statement


upload_2017-12-19_7-54-24.png


Homework Equations

The Attempt at a Solution


F12 is just an internal force caused by the joint 1 right? how can an internal force cause a torque?
 

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Whether a force is internal or external depends on what system you are considering. Which system are you considering?
 
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