I need help drawing the free body diagram for this question! thanks! During a ru

Question

I need help drawing the free body diagram for this question! thanks!

During a running stride, a person’s foot is on the ground and the ground reaction force is 354 N in the x direction and 1295 N in the y direction. The foot has a mass of 1.07 kg, a moment of inertia of 0.445 kg m2, and is undergoing angular acceleration of 7.1 rad/s2. Its linear acceleration is 4.57 m/s2 in the x direction and 2.8 m/s2 in the y direction. Relative to the center of mass of the foot, the x, y coordinates of the center of pressure of the ground reaction force are 0.051, -0.04 m and the coordinates of the ankle joint are -0.048, 0.054 m. What is the torque (Nm) produced by muscles that span the ankle joint?

Explanation / Answer

The free-body diagram is as below:

I am just sharing the formulae to be used in calculating torque.

Torque = Moment of inertia x angular acceleration

there is another formula for determining torque.

Torque = force x perpendicular distance between point of application of force and point of of rotation

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