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 (the atlanto-occipital joint). 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. (a) Calculate the force (in N) exerted by these muscles. (Assume  w = 48 N, r1 = 4.8 cm, and r2 = 2.9 cm.) magnitude Ndirection ---Select--- upward downward to the left to the right (b) What is the force (in N) exerted by the pivot on the head? magnitude Ndirection ---Select--- upward downward to the left to the right

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Center of Gravity of a system

The centre of gravity is a property that is based on the geometry of a rigid body or any particle. It is described as an equilibrium point or a hypothetical location where the total weight of the body is concentrated.