Accuracy of Gravity: -9.8m/s/s +- _______m/s/s

[StephenDoty]

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

 

[StephenDoty]

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.

 

[Dick]

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.

 

[StephenDoty]

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)