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 in academic exchange and cooperation home and abroad. DUT has signed academic agreements with more than 128 institutions of higher education or scientific research in more than 21 countries and regions. Dalian University of Technology Dalian University of Technology (DUT) (), colloquially known in Chinese as Dàgōng (大工), is a public research university located in Dalian (main campus) and Panjin in Liaoning, China. DUT, previously renowned as one of the Big Four Institutes of Technology, is among China's top universities for engineering and technology. It is a Chinese Ministry of Education Class A Double First Class University, and is also