Mechanical energy swing because of the work done by the pendulum to oppose these non-conservative forces. That the loss of mechanical energy in a system always resulted in an increase of the system's temperature has been known for a long time, but it was the amateur physicist James Prescott Joule who first experimentally demonstrated how a certain amount of work done against friction resulted in a definite quantity of heat which should be conceived as the random motions of the particles that comprise matter. This equivalence between mechanical energy and heat is especially important when considering colliding objects. In an elastic collision,
North University of China and Art 13. Software School 12. Graduate School 13. College of Continuing Education North University of China was authorized by the State Council to confer M.S. degree in 1981 and Ph.D. in 1998. At present, the university has the right to confer M.S. degrees in 20 disciplines, and Ph.D.s in 4 disciplines. The university has 8 provincial and ministerial key disciplines, including Mechanical Manufacturing and Its Automation, Mechatronic Engineering, Test & Measurement Technology and Instrumentation, Materials Processing Engineering, Applied Chemistry, Special Mechanical System and Its Application Engineering, Energy Materials Engineering, and Precision Instrument and Mechanism. Over the years, with conditions