Force
Sir Isaac Newton described the motion of all objects using the concepts of inertia and force, and in doing so he found they obey certain conservation laws. In 1687, Newton published his thesis "Philosophiæ Naturalis Principia Mathematica". In this work Newton set out three laws of motion that to this day are the way forces are described in physics.
John Ernst Worrell Keely
Burk and Scott reported their findings to Mrs Moore, who was concerned by the negative report, and also by dismissive articles in the press. It was reported on March 22, 1896 that Mrs Bloomfield Moore had arranged with Professor Wentworth Lascelles Scott of London to investigate Keely's claims of etheric force and also to examine his other inventions. It was said that "an important series of tests will be made in the presence of the scientist". Lascelles Scott was allowed to examine whatever he wanted and had complete instructions on its use from Keely. After spending a month investigating, Lascelles Scott stated to a meeting of the Franklin Institute that "Keely has demonstrated to me, in a way which is absolutely unquestionable, the existence of a force hitherto unknown."