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Solved: ‘Unlike most of the other muscles in our bodies,
Chapter 9, Problem 35(choose chapter or problem)
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.
Figure \(9.44\) A person clenching a bullet between his teeth.
Equation Transcription:
Text Transcription:
9.44
Questions & Answers
QUESTION:
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.
Figure \(9.44\) A person clenching a bullet between his teeth.
Equation Transcription:
Text Transcription:
9.44
ANSWER:
Part (a)
Step 1 of 4:
Our teeth can exert larger forces on the objects held between them. This is because the masseter muscle in the jaw is located far from the joint. Consider a bullet is in the teeth and a force is exerted on it. The reaction is in the downward direction, therefore, the force is in the upward direction. We are going to find the force by the lower teeth on the bullet.
The main force for biting
The perpendicular distance between the joint and the place where main force acting
The perpendicular distance between the joint and the bullet
The force on the bullet is
