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,
A Cellarful of Noise A Cellarful of Noise A Cellarful of Noise is the title of Brian Epstein's 1964 autobiography. His assistant, Derek Taylor, was the ghostwriter of the book, which describes the early days of The Beatles, whom Epstein managed. Epstein asked John Lennon what he thought the book should be called, and Lennon suggested "Queer Jew". Lennon was later quoted as saying that the book should have been titled, "A Cellarful of Boys" in reference to Epstein's homosexuality. In the 1978 film "All You Need is Cash", a book by Leggy Mountbatten—the manager of the Rutles and a parody of Epstein—is titled