Question 1-4 Points When your knee bends, the quadriceps muscle is stretched. Th

Question

Question 1-4 Points When your knee bends, the quadriceps muscle is stretched. This increases the tension in the quadriceps tendon, which is attached to your kneecap (the patella). This in turn increases the tension in your patella tendon, which attaches your kneecap to the tibia. At the same time the femur pushes outward on the kneecap to prevent it from moving. If the tension in each of the tendons in the figure to the right is 55N and the angle between the patella tendon and the horizontal is 25°, calculate the magnitude of the force exerted by the femur on the patella assuming that the patella is in static equilibrium. Quadric tendon Tibia Patella tendon

Explanation / Answer

Given

Tension =55N

Angle =25

Magnitude of force =T×sin 25

55×.42=23.10N on patella by femur.

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