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Atwood Machine Lab calculations 
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#1
Oct1507, 01:09 AM

PF Gold
P: 824

1. The problem statement, all variables and given/known data
My results are coming out funny and I was wondering if I was doing something wrong. I have to find acceleration due to gravity. one of my values .... m2 (decending mass) = 60g m1(ascending mass)= 50g distance traveled= 95.3cm or .953m time traveled average= 19.60s total mass (m1 + m2)= 110g 2. Relevant equations am (measured)= 2y/t^2 at(theoretical) = (m2m1)g/(m1 + m2) 3. The attempt at a solution well I try to find g from the am (or measured acceleration) by using the am and plugging into the theoretical accleration (at) equation but find g instead of a. am= 2(.953m)/(19.60s)^2 am= 0.00496m/s^2 then plugging into the at equation.. am(m1+m2)/ (m2m1)= g [0.00496m/s^2 (110g)]/ 10g= 0.54m/s^2 ===> this is so not 9.8m/s^2.. Basically that's it..except I also find the theoretical acelleration from using 9.8m/s^2 which would be the ideal and find that but I get... at= (m2m1)g/ (m1 + m2) at= (10g)(9.8m/s^2) / (110)= .891m/s^2 for acceration. I'm supposed to ignore the friction.. I really don't know why it comes out like this..Am I doing anything incorrectly?? I have to get this right or explain why it went wrong since this is for a lab report. Thank You . 


#2
Oct1507, 03:53 AM

Emeritus
Sci Advisor
PF Gold
P: 4,980

You seem to be doing the analysis correctly. I'd guess that there was some sort of unwanted resistance in the pulley system, because 19.6 seconds is a long time to travel 1 meter.



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