The large quadriceps muscle in the upper leg terminates at its lower end in a te

Question

The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (see Figure a). The forces on the lower leg when the leg is extended are modeled as In Figure b, where T Is the force of tension in the tendon, w is the force of gravity acting on the lower leg, and F Is the force of gravity acting on the foot. Find T when the tendon Is at an angle of 25.0 degree with the tibia, assuming that w = 34.0 N, F = 12.0 N, and the leg Is extended at an angle 9 of 40.0 degree with the vertical. Assume that the center of gravity of the lower leg is at its center and that the tendon attaches to the lower leg at a point one-fifth of the way down the leg. (Give the magnitude.) 255.73 Your response differs from the correct answer by more than 10%. Double check your calculations. N

Explanation / Answer

About the pivot (knee),
T*sin25.0º*L/5 = (34N*L/2 + 12N*L) * sin40.0º length L cancels
T =220.53 N
T =220.53 N

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