Mechanics Gravity : Newtonian Relationships
by Nathaniel Stites, M.A./M.S.
Newton's Law of Universal GravitationT. Henderson, The Physics Classroom - An excellent tutorial on Newton's theory of gravity including practice exercises.
Newton and EinsteinJ. Imamura, U. Oregon - A summary of Newton's laws, their shortcomings and Einstein's theories of gravity.
Inverse Square LawR. Nave, Hyperphysics - A detailed look at inverse square relationships throughout physics.
Philosophiae Naturalis Principia MathematicaI. Newton - A reproduction of the preface to Newton's famed Principia (1687) and links to the full text.
Philosophiae PrincipiaA photograph of Newton's own copy of the Principia and the fabled apple tree.
News & Events
Cavendish Experiment in Top Ten of All TimeThe Cavendish Experiment was selected by physicists as one of the ten most beautiful experiments of all time.
Gravitational Constant ControversyThe story of the controversy over the value of the gravitational constant.
Measuring the Gravitational ConstantAn article from Physics Today about a modern-day experiment to measure the gravitational constant.
Current Science NewsLive news feeds from around the world of science.
Big G MeasurementUniversity of Washington Physicists determining the value of the gravitational constant.
Measuring Gravity on Small Length ScalesThis Stanford University research group is measuring the force of gravity on very small length scales and testing Newton's and Einstein's models of gravitation.
Google ScholarGoogle - Research database allows searching of the scholarly literature.
Gravity SimulatorB. Willis, Worsley School - A simulation of the effect of gravity on orbiting bodies. Illustrates Kepler's laws on which Newton based his theories.
The Cavendish ExperimentU. Kruse & T. Tran, U. Saskatchewan - A detailed explanation of the Cavendish Experiment, including a simulation and pictures of the real apparatus.
Newtonian Orbit SimulatorExplore the concept of orbits as Newton envisioned them with this Java simulation of Newton's original thought experiment.