# center of gravity

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The center of a body’s mass, which is the point at which all parts are in balance with one another. The center of gravity depends on the body’s position in space, anatomic structure, gender, habitual standing posture and whether external weights are held

## cen·ter of grav·i·ty

(COG) (sen'tĕr grav'i-tē)
The point on a body or system where, if pressure equal to the weight of the object is applied, forces acting on the object will be in equilibrium; the point around which the mass is centered; the location of the COG in an adult human being in the anatomic position is just anterior to the second sacral vertebra.
Synonym(s): centre of gravity.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Vectors of absolute linear velocity of the mass centers projected in reference coordinate system are: - for body 1:
For the MSSB model of the medium-stiff building, compared to the rigid base case, the pebble layer reduced the horizontal displacement of the mass center at the column top by 38% and reduced the uplift of the foundation by 56%.
As [alpha]-[[alpha].sub.0] = 2n[pi](n = 1, 2 ...), the orbital trajectory of the mass center returns to an another circular orbit; meanwhile, the transfer time [t.sub.f] and the transversal thrust acceleration [f.sub.[alpha]] can be derived as
where [L.sub.[alpha][beta]] is positive when the acting point of the planing force is behind the mass center and vice versa.
[x.sub.2] = v--vessel mass center's translational motion speed along the x axis;
Differentiating (10), the first mass center velocity is
Output value of the mass center in the intersection point set is regarded as the position of the vanishing point.
Pang [17-28] finally obtained the acceleration of mass center of microscopic particle in the nonlinear quantum mechanics, Equation (49), which is denoted as
where [s.sub.i] = sin ([[theta].sub.i]), [c.sub.i] = cos([[theta].sub.i]), i = 1,2,3; {[r.sub.i1]} is a vector between the mass center of body i and point 1; {[r.sub.j2]} is a vector between the mass center of body j and point 2.
The direct effects of knee positioning and range-of-motion on racket movement are minimal, however there are several indirect biomechanical effects on the forehand motion such as movement of the body mass center, work of the knee, hip and back joints, and the angular range-of-motion of the hips and torso.
In the first model, we will examine how mass is distributed in the spherical system (including the position of mass center with the respect to geometric center of the system) under the condition that only the gravitational force acts in the system, whereas the opposing force brought about by heat pressure is absent.
From welding, the driveshaft proceeds to a Truing Machine which aligns the tube on a mass center related to the vehicle's true running center.

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