well it is usually studied in "school" for architect and mathematics purposes but it is important to know in case of a future profession and for state tests for graduates. ;
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Rotational motion is rotation of a body about its center of mass.
angular momentum
It is the distance from the center of the orbit to the center f the orbiting body.
They need to convert rotational motion to motion of some other form - usually linear motion. That can only be accomplished through the use of specific irregular shapes.
No, a screw is not an inclined plane. Although a screw can be used to convert rotational motion into linear motion, it is fundamentally different from an inclined plane, which is a flat surface that is slanted at an angle.