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December 18, 2014

December 18, 2014

Posted by **Sandra** on Saturday, February 21, 2009 at 2:53am.

1). What is the acceleration of m1?

2). What is the acceleration of m2?

3). What is the acceleration of the second pulley?

WHAT I TRIED:

To find m1 I tried a = (m1-m2)/(m2+m1) but that did not work. ( The value is negative but I entered it as positive that might be a problem)

To find m2 I tried m2a2=T-m2g, finding the tension of then implicating it in the formula to solve for the a2 acceleration but that did not work.

The last part I wrote 0 just because the second pulley does not have mass, so I need help.

- Physics -
**bobpursley**, Saturday, February 21, 2009 at 4:16amLetting a be the acceleration of m1, and b be the acceleration of m2.

Note that the lower pulley will have an accelerlation of b/2, but this is the acceleration of m2. So

a=b/2

Consider the force on the ceiling holding the upper pulley:

F=m1(g-a)+m2(g+a)

and the tension on the lower rope..

T=m2(g+b)

But the upper force -lower force=system mass* system acceleration

or F-T=m1*a-m2*b

or

m1(g-a)+m2(g+a)-m2(g+b)=m1*a-m2*b

Think on that, it is after all, three am here, and I could be in error.

If correct, you can solve for a, and b.

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