Conditions for Stable Equilibrium of the Upright Human Body in the Absense and Presence of External Influence

The proposal article is the union of the two previous scientific works [1,2]. The given paper studies conditions of the equilibrium stability of a cylinder - shaped homogeneous body. Thus, conditions of the equilibrium stability of different proportion upright standing men were studied. A new method allowing determination of a man’s common centre of gravity was developed. An optimal bending forward angle at which the degree of the equilibrium stability of an upright standing man reaches its maximum value was determined. Hence, the appropriate conclusions were drawn. External forces are introduced herein, which may disturb the stable equilibrium and cause the body to tumble. The paper also introduces the concept of the coefficient of the stable equilibrium and proposes a formula for its calculation. Finally, a formula is set up to obtain the maximum value of external forces under which the body still maintains the state of equilibrium.