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Gravity Lab

  1. Jan 31, 2008 #1
    I am working on a lab and I need to know the accuacy of gravity=-9.8m/s/s? So I need the +- blank after the -9.8m/s/s. -9.8m/s/s +- _________m/s/s

    Thank you

    Stephen Doty
  2. jcsd
  3. Jan 31, 2008 #2
    Is there an accuracy error for gravity? Or do you just use the other number's accuracy error as the error of accuracy when doing f=mg. So the m has an accuracy is +-.02g so when doing f=mg what do I do for the accuracy error of gravity in the equation: total accuracy error= accuracy error of m/m + accuracy error of gravity/g.
  4. Jan 31, 2008 #3


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    Just use the accuracy level of things you actually measure. g is not constant, it depends on geology and altitude among other things. But those aren't likely to be variables in your lab experiment.
  5. Feb 1, 2008 #4
    So for the accuracy equation for the f=mg : total accuracy= (.00002kg)/0.2704kg + 0/(9.8m/s/s)

    From the equation: total accuracy = accuracy of m/m + accuracy of gravity/g

    And for f=mg do I use (-9.8m/s/s) or (9.8m/s/s)
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