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  1. F

    Understanding Force Relationships: F_A & F_B

    Thank you very much, that was extremely helpful.
  2. F

    Understanding Force Relationships: F_A & F_B

    Homework Statement http://img221.imageshack.us/img221/604/yesor.jpg My question is: how would I know that F_B has to act perpendicular to F_A? Are there any rules or is there any logic that I am supposed to know?
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