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Not Understanding Constraints

  1. Feb 2, 2013 #1
    I have no idea what constraints are, nor do I understand why they are important.

    I get where the constraints in these two examples come from, but not why they're significant.

    These seem to be relationships between variables, and not much of a "constraint" in the sense I know the word.

    Can someone give a quick definition or some insight into this?
     

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  3. Feb 3, 2013 #2

    Simon Bridge

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    If I chained you to a wall - the length of the chain is a constraint on your motion. The size of the wall is another one.
    I'm pretty sure you would be able to tell why these constraints were important.
    There are quite a few - you understand why the wedge being constrained to move only horizontally is significant right?

    So which ones do you have trouble with?
     
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