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.
Johannes Stark
Johannes Stark (, 15 April 1874 – 21 June 1957) was a German physicist and Physics Nobel Prize laureate. He is known for identifying the Stark effect. He was later closely involved with the "Deutsche Physik" movement under the Nazi regime.