The physics of spinal manipulation: work-energy and impulse-momentum principles.
The purpose of this article was to illustrate that the work-energy and impulse-momentum relations are derived from Newton's second law, and, thus, will give identical results to F = ma for any force system analysis. It should be noted that using the work-energy or the impulse-momentum approach requires that all external forces acting on a system are considered. Furthermore, it must be emphasized that any force acting internal to the system (e.g., muscular forces in the system "chiropractor") do not enter these equations.
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Human Performance Laboratory, Faculty of Physical Education, Calgary, Alberta, Canada.
D055592:Biophysical Phenomena; D001703:Biophysics; D002684:Chiropractic; D006801:Humans; D013131:Spine / Q000502:physiology