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Question: even when the bead is held erect as in the...

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Even when the head is held erect, as in the figure below its center of mass is not directly over the principal point of support atlanto-occipital joint, point A). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class. If the head weighs 53 N, calculate the force exerted by the muscles, FM, using the information in the figure. Number What is the force exerted by the pivot on the head, FJ? Number x 4.7 cm 53 N x2- 2.1 cm
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