# Incline, pulley and friction!

1. Sep 17, 2007

### jeremy04

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

The pulley is light and frictionless. Find the mass M1, given that M2 (6.00 kg) is moving downwards and accelerates downwards at 3.61 m/s2, that θ is 30.0°, and that μk is 0.490.

2. Relevant equations

F=ma
F||=mg*cos(theta)
Fper=mg*sin(theta)

3. The attempt at a solution

I have no idea where to start this problem..

I know how to find F|| and Fperendicular when theres no pulley/no friction.. no idea where to start..

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• ###### prob75_fricpullplane.gif
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2. Sep 17, 2007

### learningphysics

Take the freebody diagram of M1... write $$\Sigma\vec{F_x} = m\vec{a_x}$$ and $$\Sigma\vec{F_y} = m\vec{a_y}$$ where x is along the plane, and y is perpendicular to the plane.

similarly write an F=ma equation for M2.