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Linear Kinetics: The Study of Force and Movement

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The free body diagram

Figure 9.11 A resting object is acted upon by its weight (W = mg) and the equal and opposite reaction force (R) in the vertical plane. There are no horizontal forces and the resultant force is R – W = 0

Figure 9.12 Free body diagram

Figure 9.13 Free body diagram

Figure 9.15 Free body diagram showing that the force vectors of the knee extension (fv) can be split into vertical (cv) and horizontal (ch) components during two phases of the rear support (1) and (2) flat-out sprinting, as well as the rear support of the starting phase (3).

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