. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. r Let N (fig. 205) be the point acted upon by any two forces N F, N F', which form an angle F N F', and the line N R their resultant, which will draw ihe point in the direction NR. But if a third force NR', equal and opposite to NR, be applied, it will destroy the motion in NR, and the point N will remain at rest by the simultaneous action of the three forces NR', NF, NF. Fig. 207. D 11 Fig. 208. Centre of gravity.—The centre of gravity of any body is a point about which, if acted upon only by the force of gravity, it wi
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. r Let N (fig. 205) be the point acted upon by any two forces N F, N F', which form an angle F N F', and the line N R their resultant, which will draw ihe point in the direction NR. But if a third force NR', equal and opposite to NR, be applied, it will destroy the motion in NR, and the point N will remain at rest by the simultaneous action of the three forces NR', NF, NF. Fig. 207. D 11 Fig. 208. Centre of gravity.—The centre of gravity of any body is a point about which, if acted upon only by the force of gravity, it will ba- lance itself in all positions; or, it is a point which, if supported, the body will be sup- ported however it may be situated in other respects; and hence the effects produced by or upon any body are the same as if its whole mass were collected into its centre of gravity. To find the centre of gravity of any plane body mechanically, let the plane a e d b (fig. 208) be sus- pended freely by a string from the point a, to which a plumb- line ft b is also at- tached — the latter will coincide with the vertical line a b, which is to be marked with a pencil: then suspend the plane and plumb-line from a second point f, when the plumb-line will hang vertically in the line e d, inter- secting a b in c, the point c will be the centre of gravity of the To find the distance of the head and feet from the centre of gravity of the human body in a horizontal position; balance the body placed upon a plane a b on a triangular prism d e, as in fig. 209; then draw a line on the plane Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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