1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Propagation of uncertainty

  1. Oct 18, 2014 #1
    I have measured the period of the pendulum
    T=2.18 +/- 0.02

    which is consistent with the true period 2.19865... so I expect myself to find a consistent value of g if I apply the formula propagating the error in the right way.

    I get
    g=9.96 +/- 0.2

  2. jcsd
  3. Oct 18, 2014 #2
    Assuming you are referring to a simple pendulum what is it's length, and the error in that measurement? The final calculated value for g will involve both errors .
  4. Oct 18, 2014 #3
    Thanks for your reply. Length is 1.20 meter without error. I'm training myself with a simulation on computer. The problem here is calculation, I discovered that usually to find g, we find the slope of the line L = g/4pi^2 * T^2
    I also noticed that if i take T = 2.20 and T = 2.16, and I calculate g, the real value is between them.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook