Newton's laws multiple objects contact forces

[tigerwoods99]

Homework Statement

Three crates are arranged. Their masses are m1=29.8, m2= 15.3, m3= 27.3. The applied force of 910 N is directed horizontally and the coefficient of friction is u= .277

WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M1 and M2?
WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M2 and M3

Homework Equations

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The Attempt at a Solution

acceleration of the three masses = 9.85

 

[PhanthomJay]

Your answer for the acceleration of all 3 blocks looks correct. What's the acceleration of each block? Answer that question and then draw free body diagrams of the blocks and use Newton's laws for each block.

 

[tigerwoods99]

isn't the acceleration the same?

 

[PhanthomJay]

isn't the acceleration the same?

yes, they are.