5. The following table shows joint position coordinates for the hip, knee, and ankle during a single frame of a countermovement jump. Joint X Y Marker position position 28.95 Hip 57.01 Knee 41.31 22.87 9.03 Ankle 49.36 a. Determine the absolute angles of both the thigh and the shank b. Using the law of cosines, determine the relative knee joint angle in angle of articulation c. Determine the relative knee joint angle in degrees of flexion

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Q: d W Pm a Ps

A: The free body diagram of the system is showing below –

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.