# Question: the shankandfoot system during walking is shown in the figure...

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The shank-and-foot system during walking is shown in the figure to the right. A force J and a moment M from the human body are transmitted to the knee joint K. Mass of the shank is 4.25 kg and its weight S is acting at point A. Mass of the foot is 0.8 kg and its weight F is acting at point B. The resultant reaction force R acts at H at an angle α as shown in the figure. Given that the shankand-foot system is in equilibrium, O x y A = 35 N B = 20 N 45° 30° (a) Write down force equilibrium equations in the x- and y- axes. (b) Write down the moment equilibrium equation about the heel H. (c) Calculate the reaction force R, angle α and moment M. (Take the gravitational acceleration g = 10 m/s2)