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STATICS problem: Minimum Resultant Force

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  1. Jan 26, 2016 #1
    Problem Statement: If the resultant force acting on the bracket is required to be a minimum, determine the magnitude of F1 and the resultant force. Set ∅=30 deg.

    Probs.2-51_52_53.jpg

    I have found the components of each force and set them up into a resultant vector, with F1 solved symbolically into its components. I'm not sure how to find the magnitude of F1 so that the resultant is a minimum.

    Also, what is the significance of the 'u' axis?

    I understand I have to take the derivative of the resultant but I'm not sure how its done. Any help is appreciated, Thanks!
     
  2. jcsd
  3. Jan 26, 2016 #2

    RUber

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    You should have something that looks like ##R=(A+x)\hat x + (B + y)\hat y## where x and y are the components of F1. Minimize the magnitude of R.
    Using the angles, you should be able to write x and y in terms of magnitude times either sine or cosine to get them to one variable.
    Then you can use the standard derivative with respect to magnitude variable to find the minimum.
     
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