# Homework Help: Dipping plane and friction

1. Mar 11, 2013

### safat

1. The problem statement, all variables and given/known data
Find the minimum μ required between wedge M and ground so that it stays static.

2. Relevant equations

I already found the equations for accelerations and tension (when μ is big).
Do I need them?

3. The attempt at a solution
I would like to know whether I found all the forces acting on the wedge. (see attachment)
Which component should I use for the green arrow force?
NB the red forces act on the wedge

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Last edited: Mar 11, 2013
2. Mar 11, 2013

### haruspex

Is the wedge massless? Is there friction between the wedge and M1?

3. Mar 11, 2013

### safat

no, wedge has mas M, and its surface it's smooth.

4. Mar 12, 2013

### haruspex

F1 and F2 are the tension, yes?

5. Mar 12, 2013

### safat

I think so.

6. Mar 12, 2013

### haruspex

Go through the usual free body analysis on the two blocks (assuming the wedge is stationary) to find the acceleration and the tension. Then figure out the forces the tension applies to the wedge.