When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. Figure P 8.39 shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 320  N weight of the upper torso is at the center of the spine. The 160  N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12^∘ angle to the spine. Suppose the person
When you bend over, a series of large muscles, the erector spinae, …
Oct 11, 2020
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