The centre of gravity is the imaginary point in which the total weight of the body acts through. The centre of gravity does not change position, it shifts due to the locomotion (movement) of the object.
The centre of gravity can be subjunctive to the speed of the walk- resulting in the overall movement of the arms and legs on a subject changing to compensate. The graph below shows the change in the maximum arm distance, to create stability in the walk, so the subject does not topple.
Figures and science. (Anon, 2016).
The below diagram shows the effect the force has on the centre of gravity- in circumstances were it its equal (and won’t topple).
C.O.G effects. (Encyclopedia Britannica, 2016).
This principle can also be applied to the walk cycle movements. In humans, the COG lies roughly where the belly button is.
The position of the COG. (Design & Illustration Envato Tuts+, 2016).
This is between things acting as supports against the ground. You can see if the character is in equilibrium by drawing a line directly down the centre of the pose. If it runs through the COG, the character is in balance. If not, the character topples. This is demonstrated in the image below.
Demonstrating the effect of COG. (Design & Illustration Envato Tuts+, 2016).
If you look at the illustrations below, drawing an invisible line shows the character is still in balance.
Two of the graphics showing the matter of COG. (Design & Illustration Envato Tuts+, 2016).
Anon, (2016). [online] Available at: http://www.dtic.mil/dtic/tr/fulltext/u2/a409793.pdf [Accessed 31 Oct. 2016].
Encyclopedia Britannica. (2016). centre of gravity | physics. [online] Available at: https://www.britannica.com/science/centre-of-gravity [Accessed 31 Oct. 2016].
Design & Illustration Envato Tuts+. (2016). Human Anatomy Fundamentals: Balance and Movement. [online] Available at: https://design.tutsplus.com/articles/human-anatomy-fundamentals-balance-and-movement–vector-20936 [Accessed 31 Oct. 2016].