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 born China, several departments, including Electrical Engineering, Physics and Law, were transferred to other universities and institutions. Meanwhile, scholars from other universities came to enlarge the departments of Chemical Engineering, Mechanical Engineering. The university started to expand right after the rearrangement, attracting more scholars and funding. To ensure future growth, the then-headmaster, Bochuan Qu, strategically moved the university's main campus to the bay area of suburban Dalian. In October 1960, DIT became one of the 26 key national universities directly under the State Ministry of Education. Graduate School of DIT was established in April 1986. In March 1988, DIT changed