Thanks for the videos! They were very helpful to understand my orthodontist's diagnosis :) However, your description about center of rotation and the force applied is confusing / wrong. When an applied force causes an object to rotate, it is because that object experiences a resistance to the movement. This resistance has to be away from the point where the force is applied, for the object to rotate. The center of rotation will depend on all the forces affecting the object, and it will be different from the point where the external force is applied.
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