W B A Y Fj FM
Question 3) The position of the head and neck and the forces acting on the head are shown in the figure. The center of gravity of the head of mass m=8 kg is located at point C. The joint reaction force of FJ=147 N, which makes an angle of α= 42° with the vertical from the point B, is acting on the skull by the neck extensor muscles. The center of the atlantooccipital joint is located at point B. For this flexion position of the head, FM neck muscle force, which makes an angle of γ with the horizontal from the A point, is effective. (Take the gravitational acceleration g as 9.81 m/s2). Accordingly;
a) Calculate the angle γ of the FM muscle strength with the horizontal.
b) Calculate the FM muscle strength. (Write your result in N.) Answer
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