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Ask help for "Free Body Result" in post processing



I am new user of NX simulation,

I am confused for "Free Body Result" in post processing, as follows:

1.  Application for "Free Body Result"

     What can i do using "Free Body Result" ?

2.  "Interface Definition" in dialog of "Free Body Result"

     What purpose do we define the option ?


Could anybody explain the points and give me some exapmles ?

Thank you in advance !