# Two Masses, a Pully, and an Inclinde Plane

1. Oct 17, 2007

### Robdog

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

Block 1, of mass m1 = 0.700kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2. Assume that the blocks accelerate downword with an acceleration of magnitude = 0.250m/s^2 and that the coefficient of kinetic friction between block 2 and the plane is u = 0.200.

Tried to attach a good picture of the angle at which the block is 30

2. Relevant equations

m2a=T-f-m2gsin(30)

With T=6.69
F=un Which n=8.5 so then it would be 1.7

3. The attempt at a solution

well to set it up im not sure if im right but i tried to sub all know values into the above eq

M2(2.50m/s^2)=6.69-1.7-M2(9.8m/s^2)Sin(30)

i keep geting wrong answer + i dont konw how to solve when M2 is on both sides? What do i do. I know the answer has to be smaller than .700kg because if it were larger they would not move.

#### Attached Files:

• ###### MLD_2l_2_v2_2_a.jpg
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2. Oct 18, 2007

### Robdog

any idea?

3. Oct 18, 2007

### Staff: Mentor

Good. That's Newton's 2nd law applied to mass 2. Do the same for mass 1.

How do you know the tension?