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B Can %age uncertainty in value ever be greater than 100?

  1. May 4, 2017 #1
    We were given an experiment in which the %age uncertainty of majority of students happened to be greater than 100?
     
  2. jcsd
  3. May 4, 2017 #2

    sophiecentaur

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    Sit in the seat of an off road vehicle and try to draw a graph of a Hooke's Law experiment whilst on the move. How bad could it get?
     
  4. May 4, 2017 #3
    Never did that. You tried it? What was the uncertainty?
     
  5. May 4, 2017 #4

    sophiecentaur

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    I never did it but can't you imagine the sort of results?
    If you did the experiment for long enough and took enough readings, you could end up with a pretty good value for the spring constant. Averaging (I.e.data filtering) can be a powerful tool.
     
  6. May 4, 2017 #5
    Why the uncertainty can not be greater than 100%. Prove it logically?
     
  7. May 4, 2017 #6

    russ_watters

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    Staff: Mentor

    What if the expected result in an experiment is zero? What is the percent uncertainty then?
     
  8. May 4, 2017 #7

    Dale

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    I don't understand why you are asking the question. You already have data in front of you where the relative uncertainty is greater than 100%, so clearly using that data you can demonstrate that the relative uncertainty can be greater than 100%.

    Since you already have data showing that it can be greater than 100%, what is your real question?
     
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