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
University of Campinas School of Mechanical Engineering fluids, vibrations and noise. Some companies and institutions may be cited are Alcan, Eletrobras, Vale, General Motors, Mercedes-Benz, Brazilian Army, US Air Force and other institutions and industries can be seen on FEM website. FEM also have agreements and sponsorship with other industries and coorporations like Schaeffler Group that also sponsors extracurricular projects. In 1992, inspired by MEJ, was created Motriz - Junior Enterprise of the Faculty of Mechanical Engineering. The Motriz is a nonprofit civil association that aims to optimize productivity and contribute in resolutions to problems in Mechanical Engineering. With the help of teachers of the University, the