Kinetic Friction with Blocks Need Help.

[Larin]

Homework Statement

Suppose the coefficient of kinetic friction between m₁ and the plane in the figure is μ_k=0.20, and that m₁=m₂=2.2kg.
a) As moves down, determine the magnitude of the acceleration of m₁ and m₂ given θ=28^o.

b) What smallest value of μ_k will keep this system from accelerating?

Homework Equations

F=ma

The Attempt at a Solution

I am not sure even where to begin.

 

[pgardn]

So what are the forces acting on both masses? Can you draw FBD's to help you get some equations to solve for a?

 

[Larin]

The normal force, the force of the weight, and the force of tension are acting on both blocks.

 

[Larin]

I am still really confused though...