The upper leg muscle (quadriceps) exerts a force of 1210 N, which is carried by a tendon

patella-angles

#1

The upper leg muscle (quadriceps) exerts a force of 1210 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in Figure 5.43. Find the magnitude and direction of the force exerted by the kneecap on the upper leg bone (the femur).

Answer: