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alomari

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- Homework Statement
- A small box of mass m1 is sitting on a board of mass m2 and length L (Figure 1). The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is μs. The coefficient of kinetic friction between the board and the box is, as usual, less than μs.

Throughout the problem, use g for the magnitude of the acceleration due to gravity. In the hints, use Ff for the magnitude of the friction force between the board and the box.

Figure1 of 1

The figure shows a box of mass m 1 lying on a board of mass m 2 and length L. The board lies on a horizontal surface. Force F acts to the right on the board.

Part A

Find Fmin, the constant force with the least magnitude that must be applied to the board in order to pull the board out from under the the box (which will then fall off of the opposite end of the board).Express your answer in terms of some or all of the variables μs, m1, m2, g, and L. Do not include Ff in your answer.

- Relevant Equations
- Static friction force : Fs = μs N

Hello, I'm struggling understanding why my answer to this question is incorrect. I know the right answer, but why is this way wrong? I have attached my solution and would really appreciate the help.

Thank you!

Thank you!