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
Dalian University of Technology the "Double First-Rate", "985 project", "211 project" and the "E9 Group" of China. During the last Chinese disciplines assessment in 2017, disciplines including engineering, natural sciences, management, economics, et al ranks highly among Chinese top universities. DUT's business education institutions are accredited by AACSB, CAMEA and EQUIS, one of eight Universities in China. Previously known as Dalian University, DUT was founded in 1949. In July 1950, the School of Engineering separated from Dalian University and became Dalian Institute of Technology (大连工学院, DIT). Due to the rearrangement of the Ministry of Education to enhance development of education and construction of new