C. Northcote Parkinson C. Northcote Parkinson Cyril Northcote Parkinson (30 July 1909 – 9 March 1993) was a British naval historian and author of some 60 books, the most famous of which was his best-seller "Parkinson's Law" (1957), in which Parkinson advanced Parkinson's law, stating that "work expands so as to fill the time available for its completion", an insight which led him to be regarded as an important scholar in public administration and management. The youngest son of William Edward Parkinson (1871–1927), an art master at North East County School and from 1913 principal of York School of Arts and Crafts, and
Work (physics) the kinetic energy of the particle by a simple derivation analogous to the equation above. Some authors call this result "work–energy principle", but it is more widely known as the work–energy theorem: The identity formula_54 requires some algebra. From the identity formula_55 and definition formula_56 it follows The remaining part of the above derivation is just simple calculus, same as in the preceding rectilinear case. In particle dynamics, a formula equating work applied to a system to its change in kinetic energy is obtained as a first integral of Newton's second law of motion. It is useful to notice that