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Homework Help: Negative support reaction? (Statics)

  1. Jun 7, 2007 #1
    Sorry for not using the template, but this question I have is not very complicated (or I hope so).
    I was creating a couple of problems with beams (Statics) and I came up with one where one of the support reactions has a negative value. The beam has 2 supports, one of them restricts all possible movements, and the other one allows movement only on the X axis (horizontal movement).
    Now, I'm not sure if that is possible, since (I think) that would make the system rotate around the support with the positive reaction.
    So, my question is, if it is possible for reaction forces to be negative.
  2. jcsd
  3. Jun 7, 2007 #2


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    I'm not sure 'negative force' makes a whole lot of sense, but 'force acting in the other direction' does. Perhaps that's what's coming up here?
  4. Jun 7, 2007 #3
    Yes, what I meant is if support reactions can go downwards instead of upwards, sorry I wasn't clear
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