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Wow ! Thank you! I've been staring at my data, and you have made realized this blunder. my h value is from the center of the pulley to the ground, which now I realize, is not the height in which the weight begins to fall from. Cheers! Mystery solved. Also, thanks to gleem for the help as well...

I'm not quire sure how you arrived at that equation. Do you mind explaining further?

You make a good point, I'll admit, I didn't critically think about this point; I was following instructions from my lab manual. I've switched the variables around to see if it yields a different result, and alas, it seems I am still getting a negative inertia. http://puu.sh/nYDQv/d35faf1af2.png

I think (m1-m2)g is my dependent variable and my independent is a (acceleration).

Sorry about that, I'm not used to the formatting here yet! It should read: (T1-T2) R = Iα

Jam, I'm working on a similar lab. Did you happen to get a negative value for your moment of inertia?

I'm currently completing an Atwood Machine Experiment with two 100g weights on either side of the pulley, with a variance in weight created by attaching dimes and pennies to either side of the weights. The point of the experiment is to validate: (m1 – m2)g = (m1 + m2 + I/R2) Homework Statement...

Hi Physics Forums, I'm excited to be a part of this community! I'm very interested in Physics, and am currently completing a couple university level courses for them. I hope to learn lots :) Firefox