How can I find the Torque needed to rotate a wooden slab with no weight applied on either end of the slab if I have a servo motor placed at the middle of the slab? diagram that shows a wooden slab connected to a motor

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    $\begingroup$ Do you need to rotate it fast or slow? Does it accelerate? If yes what is the maximum acceleration? $\endgroup$
    – NMech
    Commented Nov 9, 2021 at 18:03
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    $\begingroup$ And what you expect the running friction of the system to be. A 5kg beam on smooth roller bearings would take very little force to move. $\endgroup$
    – Tiger Guy
    Commented Nov 9, 2021 at 18:55

1 Answer 1


Torque is equal to angular acceleration times moment of inertia of your board, idealized to$ \ 1/12mL^2$.

There are interesting points to check for though.

Whit a small defect in symmetry your board can turn into a propeller and create a lift.

If the face thickness is not insignificant the whirling of the air current can become very complex.


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