As you hold your leg in this position, the upper leg exerts a force on the lower leg at the knee joint. What is the direction of this force?

A. Up B. Down C. Right D. Left Use the information in the following paragraph and figure.

Suppose you stand on one foot while holding your other leg up behind you. Your muscles will have to apply a force to hold your leg in this raised position. We can model this situation as in Figure Q8.20. The leg pivots at the knee joint, and the force to hold the leg up is provided by a tendon attached to the lower leg and the foot together have a combined mass of \(4.0 \mathrm{~kg}\), and that their combined center of gravity is at the center of the lower leg.

Transcribed Image Text:

The tendon provides the torque to raise the lower leg. 5.0 cm- 50 cm FIGURE Q8.20