Why does Thread secretly talk about scientific truth?

The thread of the screw utilizes the bevel principle,

Because W=FS and F=W/S, and because W is equal in an ideal machine, the longer S, the smaller F, and the more labor-saving. S refers to the distance that an object moves in the direction of force, F refers to the force that the object moves, and W refers to work. The inclined plane increases S and reduces the force of the object's movement, so the denser the thread, the greater the S and the more labor-saving.