(adsbygoogle = window.adsbygoogle || []).push({}); Double pulley problem--difference in acceleration

1. The problem statement, all variables and given/known data

http://img339.imageshack.us/img339/8793/picture1jv.png [Broken]

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2. Relevant equations

a= g(M-m)/M+m

3. The attempt at a solution

Okay, so overall, pulleys just confuse me. We barely mentioned them in class and there's precious little about them in our books. I tried to answer this question and was able to get the first part (a) by finding the above equation on Google. However, as the question would lead you to assume, the answer to be is NOT the same. The problem is, I see no difference other than the fact that a box was replaced by hand. I don't understand why, if the downward force is the same, you would get a different acceleration. Because I don't understand this, it's making it pretty much impossible to know what to change in order to solve part b. I don't even know where to get started...

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Double pulley problem-difference in acceleration

**Physics Forums | Science Articles, Homework Help, Discussion**