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University of Colorado
University of Colorado: Ph Et Interactive Simulations: Gravity and Orbits
Move the sun, earth, moon, and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it.
E-learning for Kids
E Learning for Kids: Antarctica Penguins: How Does the Moon Influence the Tide?
This lesson explains how the moon affects tides on Earth and about the different types of tides.
MadSci Network
Mad Scientist: Why High Tide Away From the Moon or Sun?
An excellent and thorough answer to the often asked question about high tide "bulges" on the side of Earth facing away from the Moon or Sun.
Physics Classroom
The Physics Classroom: Cavendish and the Value of G
A short description of how Cavendish measured the value of G - the universal gravitation constant and supported Newton's theory. Illustrated.
Ambleside Church of England Primary School
Ambleside c.e. Primary School: Your Weight on Other Planets
Students enter their weight here on Earth, and find out how much they would weigh on the moon and other planets.
OpenStax
Open Stax: Newton's Universal Law of Gravitation
In the following interactive students will explain Earth's gravitational force and describe the gravitational effect of the Moon on Earth. They will discuss weightlessness in space and examine the Cavendish experiment.