MechanicsGravity: Newtonian Relationships

by Nathaniel Stites, M.A./M.S.

Further Exploration

Newton's Law of Universal Gravitation

T. Henderson, The Physics Classroom - An excellent tutorial on Newton's theory of gravity including practice exercises.

Newton and Einstein

J. Imamura, U. Oregon - A summary of Newton's laws, their shortcomings and Einstein's theories of gravity.

Inverse Square Law

R. Nave, Hyperphysics - A detailed look at inverse square relationships throughout physics.

Direct Measurement Videos

Direct Measurement videos show situations that viewers can use to learn and apply physics concepts. Grids, rulers, and frame-counters are added as overlays on the video. These allow viewers to make precise measurements of quantities such as position and time.


Isaac Newton

Henry Cavendish
Henry Cavendish


Philosophiae Naturalis Principia Mathematica

I. Newton - A reproduction of the preface to Newton's famed Principia (1687) and links to the full text.

Philosophiae Principia

A photograph of Newton's own copy of the Principia and the fabled apple tree.

News & Events

Cavendish Experiment in Top Ten of All Time

The Cavendish Experiment was selected by physicists as one of the ten most beautiful experiments of all time.

Gravitational Constant Controversy

The story of the controversy over the value of the gravitational constant.

Measuring the Gravitational Constant

An article from Physics Today about a modern-day experiment to measure the gravitational constant.

Current Science News

News from around the world of science.


Big G Measurement

University of Washington Physicists determining the value of the gravitational constant.

Measuring Gravity on Small Length Scales

This 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 Scholar

Google - Research database allows searching of the scholarly literature.


Gravity Simulator

B. 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 Experiment

U. Kruse & T. Tran, U. Saskatchewan - A detailed explanation of the Cavendish Experiment, including a simulation and pictures of the real apparatus.

Newtonian Orbit Simulator

Explore the concept of orbits as Newton envisioned them with this Java simulation of Newton's original thought experiment.

You can't blame gravity for falling in love.
—Albert Einstein,
1879 - 1955