Dynamic motion involving pulleys and friction.

[DaftCrunk]

Homework Statement

http://img689.imageshack.us/img689/2315/dynamicsproblem.jpg"

Homework Equations

The Attempt at a Solution

F_C = Ff_B
m_C * 9.81 = (6.0)(9.81)(0.30)
m_C = 1.8 <---- :(

Obviously that was wrong haha. I then tried to figure out how the pulley affects the relationships of the forces, and figured:

Ff_B = M_C(9.8-a_A)
17.6 = M_C(9.8-a_A) <-----One equation, two unknowns. Need another equation, assuming this one is correct.

 

[tiny-tim]

Welcome to PF!

Hi DaftCrunk! Welcome to PF!

… Need another equation, assuming this one is correct.

Yup! … try F = ma for A-and-B.