A person bends over as shown in Figure 8.5. For most of us, the center of gravity of the human body is in or near the chest region. When bending over, the force of gravity on the person's upper torso, acting through its center of gravity, gives rise to a torque that tends to produce rotation about an axis at the base of the spine that could cause us to fall over - but this doesn't usually happen. So why don't we fall when bending over like this?

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CG W Fb Pivot