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Question
The upper leg muscle (quadriceps) exerts a force of 1250 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in Figure 9.37. Find the direction and magnitude of the force exerted by the kneecap on the upper leg bone (the femur).
Question Image
<b>Figure 9.37</b> The knee joint works like a hinge to bend and straighten the lower leg. It permits a person to sit, stand, and pivot.
Figure 9.37 The knee joint works like a hinge to bend and straighten the lower leg. It permits a person to sit, stand, and pivot.
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Final Answer
$1060 \textrm{ N, } 10^\circ$ below horizontal to the left.
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OpenStax College Physics Solution, Chapter 9, Problem 28 (Problems & Exercises) (4:57)

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