# Homework Help: 2 blocks on a table

1. Oct 8, 2008

### KSimmonsUGA

1. The problem statement, all variables and given/known data

A 3.5 kg block (block A) sits on a 6.2 kg block (block B). The larger block is sitting on a horizontal frictionless table. The coefficients of friction between the blocks are static = 0.35 and kinetic = 0.22. a) Calculate the maximum horizontal force that can be applied to teh larger blcok if the smaller block is not to slide on the larger block.
b) For the force found in part a, calculate the acceleration of each block.
c) A 35 N force is exerted on the top block at an angle of 20 degrees below the horizontal. The force from part A has been removed. Calculate the acceleration of each block.

2. Relevant equations

Sum of Forces = m*a

3. The attempt at a solution

Okay, I know I need to start with a free body diagram, but I am unsure that even that is correct. So far, I have:

Table: weight (a+b) acts down on the table, while table pushes up with normal force (Fnormal) equal to the weight of (a+b).

Block B: Weight (a+b) pushing down while the Fnormal (a+b) pushes up. Force(kinetic) pushes to the right, while Force(static) pushes to the left.

Block A: Weight (a only) pushing down while Fnormal (a+b) pushes up. Force(kinetic) pushes to right, while Force(static) pushes to the left.

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution