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Does height affect the constant of proportionality?

  1. Aug 26, 2007 #1
    1. The problem statement, all variables and given/known data

    Does height affect the constant of proportionality?

    'k'

    2. Relevant equations

    no relevant equations

    3. The attempt at a solution

    I don't think it does but I'm not sure why though.
     
  2. jcsd
  3. Aug 26, 2007 #2

    learningphysics

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    I don't understand... is k a spring constant?
     
  4. Aug 26, 2007 #3
    hookes law.
     
  5. Aug 26, 2007 #4

    learningphysics

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    k is constant within a certain range of stretching... beyond that the spring is damaged and doesn't work as Hooke's law predicts...

    height doesn't affect it.
     
  6. Aug 26, 2007 #5
    hmmm. but in the example they use falling objects...not springs. thats what I'm stuck on.
     
  7. Aug 26, 2007 #6

    learningphysics

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    But Hooke's law is for springs. For falling objects, you probably don't need Hooke's law... unless I'm misunderstanding something.
     
  8. Aug 26, 2007 #7
    ahhh. sorry what i said about hookes law. for falling objects, it stays constant since it is the acceleration. is this correct?
     
  9. Aug 26, 2007 #8

    learningphysics

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    Well, acceleration is approximated to g close to the earth... technically it does change with height... but for most gravity/falling object problems (where we aren't dealing with astronomical distances), it is taken as constant = g = 9.8m/s^2
     
  10. Aug 26, 2007 #9
    oh wait! sorry i misunderstood the problem! k is the constant of proportionality for the DRAG. so air resistance. but it still doesn't change does it?
     
  11. Aug 26, 2007 #10
    oh wait! sorry i misunderstood the problem! k is the constant of proportionality for the DRAG. so air resistance. but it still doesn't change does it?
     
  12. Aug 26, 2007 #11

    learningphysics

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    I don't think so... if the question gives it as a constant, then don't worry about it changing...
     
  13. Aug 26, 2007 #12
    okay. thank you.
     
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