The center of mass of a human body is located at a point which is fixed, but different for different people. that is always directly behind the belly button. that changes as a person bends over. none of these
The correct answer and explanation is:
The correct answer is that changes as a person bends over.
The center of mass (COM) in the human body refers to the average location of all the body mass. In a neutral, upright position, the center of mass is typically located around the pelvis, just below the navel or belly button area, but this can vary slightly depending on body composition (e.g., fat distribution, muscle mass, etc.).
As a person moves, particularly when bending over, the location of the center of mass shifts. When bending forward, for example, the upper body and head move downward, causing the center of mass to shift toward the lower body and closer to the feet. This shift is due to the redistribution of mass as different parts of the body move relative to each other. When standing upright, the center of mass aligns with the vertical axis of the body, but as a person leans or bends, this alignment is altered.
The position of the center of mass is dynamic and changes with different postures or movements. In actions like squatting, leaning, or lifting, the center of mass may move even further from the body’s base of support. This shift is essential in maintaining balance and stability during different activities. The human body naturally adjusts its posture to compensate for these changes in mass distribution to avoid falling or losing balance.
In short, the center of mass is not fixed in a specific location like “directly behind the belly button.” It is a variable point that shifts depending on posture and movement.