How Do You Calculate Acceleration with Friction Involved?

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To calculate acceleration with friction, start by drawing free body diagrams for each crate. Use the formula Force = mass * acceleration, incorporating the frictional force, which is calculated using the coefficient of kinetic friction. The net force acting on the boxes can be determined by subtracting the frictional force from the applied force. By setting up the equations for both boxes, you can find the acceleration and the force each box exerts on the other. Understanding these steps will clarify the problem and lead to the solution.
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I really don't undersand the friction chapter in my physics book, can somebody please help with one question. "Two crates of a mas of 75 and 110 kg are at rest on a horizontal surface. A 730 N force is exerted on the 75 kg box. If the coeff. of kinetic friction is .15 what is the acceleration of the boxes and the force each box exerts on the other?
Can somebody at least tell me what formaula to use. I am completely lost :frown:
 
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1) Draw the Free body force diagram for each box.

2) Write down the relations between the forces and acceleration for each box in the horizontal and vertical directions.

3) From the equations you can find the net acceleration and force each box exerts on the other.

Show us where exactly in the problem you are stuck. It will be easier to help that way.
 
Force = mass*acceleration (isn't this some law)

you have... Force - Ffriction = mass*acceleration

you know F
you know your masses
what is friction? your freebody will tell
 

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