A person is performing a rehabilitation exercise using an elastic band. He lies

Question

A person is performing a rehabilitation exercise using an elastic band. He lies on his back with one end of the band tied to his right ankle and the other end fixed above his head. Starting in the "up" position shown in figure A, the person moves his right lower limb to the "down" position shown in figure B. He pauses in that position for 1 s, and he then returns to the "up" position shown in figure A. The torque created about the right hip by the elastic band is greater in magnitude than that created by the weight of the lower limb, and more so in figure B than in figure A. The motion of the limb from the "up" to the "down" position speeds up rapidly. All other changes in the limb's motion are gradual and more so than would result from the combined influence of the elastic band and the limb's weight. We wish to perform a functional anatomical analysis of the right hip joint in the sagittal plane for this exercise. For this analysis, the system of interest is the right lower limb and pelvis. Consider the right lower limb to be a single, rigid body segment. i) Which of the following are external forces that act on the system of interest during this exercise? __ T __ F: Weights of the pelvis and right lower limb __ T __ F: Force exerted on the right lower limb by the elastic band __ T __ F: Normal and/or friction forces acting on the pelvis from the ground __ T __ F: Forces acting on the pelvis from the torso and left lower limb

Explanation / Answer

1-true( the weigth of the pelvis and right limb will be acting as the system in the above analysis is the right limb)

2-true( The force exerted by elastic band itself will be acting on the right limb)

3-false( it will not act on right limb)

4-false( it will not CT ON RIGHT LIMB)

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