The chewing muscle, the masseter, is one of the strongest in the human body. It

Question

The chewing muscle, the masseter, is one of the strongest in the human body. It is attached to the mandible (lower jawbone) as shown in figure (a). The jawbone is pivoted about a socket just in front of the auditory canal. The forces acting on the jawbone are equivalent to those acting on the curved bar in figure (b). C is the force exerted by the food being chewed against the jawbone, is the force of tension in the masseter, and is the force exerted by the socket on the mandible. Find and for a person who bites down on a piece of steak with a force of 44.3 N. http://www.webassign.net/sercp9/8-p-027.gif magnitude of R N magnitude of T N

Explanation / Answer

When the jaw stops moving, and has zero acceleration, the system will be in equilibrium with all forces balanced. Start by imagining the point where the muscle is attached as the fulcrum of a lever. Because the lever is not balanced, then we know F1 * d1 = F2 * d2. Fc * 7.50 = R * 3.50

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