Mechanical energy nonconservative forces, like frictional forces, will be present, but often they are of negligible values and the mechanical energy's being constant can therefore be a useful approximation. In elastic collisions, the mechanical energy is conserved but in inelastic collisions, some mechanical energy is converted into heat. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule. Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a
Homosexualities: A Study of Diversity Among Men and Women review from Michael Lynch in "The Body Politic". The book was also reviewed by Norman C. Murphy in "The Advocate". With Dean Gengle, Murphy presented a discussion with Bell about his book. Lynch argued that "Homosexualities" was in part an attempt by Bell and Weinberg to overcome statistical weaknesses in the work of Kinsey and his colleagues, and that as a result they had put more effort into "data processing" than into "understanding the premises and conclusions of the study." He suggested that they were "sometimes silently at odds" with Kinsey and his colleagues, and that they had limited their