- #1

iwan97

- 14

- 1

## Homework Statement

So, these 2 blocks are connected by a rope. Aluminuim block is 2kg and copper is 6kg. They are kept in motionless state via some kind of mechanism on steel surface. θ is 30 degrees. I was given dynamic and static friction coefficient (Aluminium μ

_{s}=0,61 i μ

_{d}=0,47, Copper μ

_{s}=0,53 i μ

_{d}=0,36.

Question is will these blocks move after mechanism that keeps them motionless turns off and I have to calculate force of tension in the rope. Friction of that little pulley is 0.

Solution for rope tension is 10N.

## Homework Equations

F

_{f}=N*μ

G=m*g

## The Attempt at a Solution

I found G

_{1}and G

_{2}:

G

_{1}=19.62N

G

_{2}=58.86N

I also found G

_{2x}and G

_{2y}:

G

_{2x}=sinθ*G

_{2}=29.43N

G

_{2y}=cosθ*G

_{2}=50.97N

After that I calculated force of static and dynamic friction:

F

_{sf1}=G

_{1}*μ

_{s}=11.97N

F

_{df1}=G

_{1}*μ

_{d}=9.22N

F

_{sf2}=G

_{2y}*μ

_{s}=27N

F

_{df2}=G

_{2y}*μ

_{d}=18.35N

Unfortunately, this is as far as I got because I don't understand and don't know what to do next since I never had any problems with static friction.

I hope someone can help me out on this one :)

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