- #1

Hernaner28

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## Homework Statement

A block of mass [tex]M_2[/tex] can move over another bigger block [tex]M_1=5.0M_2[/tex] . The coefficient of static friction between the small and big blocks is [tex]\mu _s=0.40[/tex] , the kinetic coefficient between them is [tex]\mu _{k,2}=0.30[/tex] , and the kinetic coefficient between the big block and the floor is [tex]\mu _{k,1}=0.50[/tex] . In a previous moment showed in the picture, a person had given the blocks a velocity v giving a boost.

## Homework Equations

Does the small block slide? Calculate the aceleration of both blocks.

## The Attempt at a Solution

I draw two diagrams, for each block. But I'm not sure if I'm missing something or if the friction forces are directionally correct. Besides I have no idea how to go on after that... these are my diagrams:

When it says "¿estatica o dinamica?" I am just wondering if that force is static or kinetic.Edit:

I think the diagram of block 2 is missing a friction force which is caused by m1 as a reaction.. Anyway I do know how to write up the friction force for the floor and big block:

[tex]f_{floor}=0.50\cdot N_2[/tex]

[tex]N_2=m_1g+m_2g=6m_1g[/tex]

[tex]f_{floor}=0.50\cdot 6m_1g[/tex]

But then?

Thanks for your help!