# Homework Help: Newton's Second Law surface+horizontal w/ friction

1. Oct 1, 2012

### Fredecus

This was a return of my test and I have filled in the forces already. I got a few problems wrong and I would like to see what the correct answers are.

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

1. Write an expression and determine the value of N1, the normal force acting on M2

2. Write an expression for and determine the value of the net force acting on the system.

3. Write an expression for and determine the value of the force (Tension[T2]) the string exerts on M1

4. Write an expression for and determine the value of the force (Tension[T2]) the string exerts on M2

2. Relevant equations

N/A

3. The attempt at a solution

1. N1=Mg-sin(α)=99.1

2. -30.18-.9-43.08=12N

3. T1=-Fcos(α)+Fs-sumFx1
T1=0

4. T2=sumFx2-mgsin(θ)+Fs2
T2=0

2. Oct 2, 2012

### Fredecus

I think I have figured it out but I am too tired at the moment to post it. I will post in the morning my new answers and the questions I still have (if any).

3. Oct 2, 2012

### azizlwl

1. N1=Mg-sin(α)=99.1
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Sin[α] is a ratio of 2 lenght. Force unit is in Newtons.