The next step in my chair design is to be certain that I've created a product that is safe and comfortable for sitting. Finding the center of mass is a proven method to understanding the stability of an object and how force or weight will impact it.
Center
of mass is defined as the "point in the object where the mass or weight seems to be
concentrated. This point can be in the
physical object or some point outside the object."
"The
center of gravity (CG) is the center of an object's weight distribution, where
the force of gravity can be considered to act. It is the point in any object
about which it is in perfect balance no matter how it is turned or rotated
around that point. For a finite set of point masses, CG may be defined as the
average of positions weighted by mass. That is, the (Sum of mass*position)/(Sum
of mass)."
"The
terms "center of mass" and "center of gravity" are used
synonymously in a uniform gravity field to represent the unique point in an
object or system, which can be used to describe the system's response to
external forces and torques. "
For the human body, the center of mass is at the
same position as with the center of
gravity. This is because force of gravity is proportional to the mass of
the body and is uniform over the entire person.
Facts and Findings
- A person's center of mass is slightly below his/her belly button, which is nearly the geometric center of a person.
- Males and females have different centers of mass- females' centers of mass are lower than those of males.
- The average ratio of center of mass to height in females is approximately 0.543 and the average ratio of center of mass to height in males is approximately 0.560.
What happens when we sit? The center of mass changes for humans as the body shifts to a seated position due to redistribution of weight!
In my upcoming analysis I will attempt to find the center of mass of an adult sitting in my chair in 3 positions.
In my upcoming analysis I will attempt to find the center of mass of an adult sitting in my chair in 3 positions.
references:
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