child Figure 9.43 A child being lifted by a father\'s lower leg. 35. Unlike most

Question

child Figure 9.43 A child being lifted by a father's lower leg. 35. Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in Figure 9.44, is attached relatively far from the joint, enabling large forces to be exerted by the back teeth. (a) Using the information in the figure, calculate the force exerted by the lower teeth on the bullet. (b) Calculate the force on the joint. Ru = 200 N =2.9 cm Masseter muscle Figure 9.44 A person clenching a bullet between his teeth. 36. Integrated Concepts

Explanation / Answer

(a)

From figure

Fm*2.9 = Ff*5.0

200*2.9 = Fm*5

FM = 116 N

(b)

Force on joint

Fj = Fm - Ff

= 200 - 116

Fj = 84 N

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