(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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.

2. Relevant equations

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

3. 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!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Frictional forces between two blocks (one over the other)

**Physics Forums | Science Articles, Homework Help, Discussion**