
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A rectangular wooden board (with negligible thickness) is placed horizontally on a table and labeled as rectangle $ABCD$. First, the board is rotated upwards around edge $AB$ by an angle $\alpha$, and then the board is rotated upwards around edge $AD$ by an angle $\beta$ and fixed in that position, with both $\alpha$ and $\beta$ being acute angles. If at this moment, there is a small wooden block with a mass $m$ on the board that has not slid off, find the friction force acting on the small wooden block.

Present the answer in LaTex format: \boxed{Your answer}
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