Using the given knee diagram, estimate the amount of torque needed to actuate the knee near 0° flexion (standing position) based on friction in the knee joint for a person of (a) 50 kg, (b) 60 kg, (c) 70 kg. Do this assuming both static loading (standing relatively still) and dynamic loading (walking), and comment on the differences. The effective cartilage cross-section area is 8 cm².

[Hint: find the normal stress in the cartilage to help determine the friction level.]

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