- #1

dlthompson81

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## Homework Statement

Three boxes are in contact and resting on a horizontal, frictionless surface. One box has mass m, the middle box has mass 2m, and the third box has mass 3m. A horizontal force of magnitude F is applied to the first box, and the three boxes slide together across the surface.

Find the force box 2 exerts backward on box 1 as the boxes accelerate across the table, in terms entirely of F.

## Homework Equations

F=MA

## The Attempt at a Solution

I already know the answer to this is 5/6. The teacher went over it in class, but I don't fully understand it. Can anyone help me out with an explanation of how exactly it works? It would be much appreciated. I have a midterm Monday, and I'm sure this will be on it. Thanks for the help.