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 Institute of Science and Technology Dalian Institute of Science and Technology Dalian Institute of Science and Technology (), is a four-year engineering college, located in Lüshunkou District, Dalian City, Liaoning Province, China. It has its origin in the Information Technology Department, established in 2002, of Dalian Jiaotong University, and became in 2003 an independent school owned by both Jiaotong University and Dalian Sunshine Century Group. It was renamed in 2011 as Dalian Institute of Science and Technology. It has now various departments, such as mechanical engineering, electrical engineering, information technology, software technology, foreign languages (English and Japanese) and fine arts. The International Cooperation and Exchange