NASA
Sci Jinks: Why Does the Atmosphere Not Drift Off Into Space?
A brief description of how the Earth's atmosphere and gravity are connected.
ClassFlow
Class Flow: Forces in Action
[Free Registration/Login Required] This flipchart explains weight and gravity and engages students in activities using force and motion.
NASA
Nasa Star Child: Planet Hop
Figure out your age and your weight on all the planets in the solar system using the formulas given here. Then type them into the correct place, and let the computer check to see if you are correct.
American Museum of Natural History
American Museum of Natural History: Meet the Universe's Main Attraction Gravity
Illustrated and animated series of short articles answers the questions, what is gravity? and what does it do?
Math Science Nucleus
Math/science Nucleus: Rocket Trip Animation
Animated sing-along storybook "Zoom Zoom" takes readers on a ride to the moon.
ClassFlow
Class Flow: Gravity
[Free Registration/Login Required] Introduction and links to information and online documentaries about gravity.
Physics Classroom
The Physics Classroom: Skydiving
The Physics Classroom offers this animation depicting the forces acting upon a falling skydiver.
NASA
Nasa: The Way Things Fall
This site from NASA compares free falling motion to falling with air resistance. Discusses Galileo's experiment. Explains why we believe all objects free fall with the same acceleration.
Annenberg Foundation
Annenberg Learner: Amusement Park Physics: The Principles of Free Fall
An article describing free fall principles in roller coaster rides. In addition to the explanation of free fall, an experiment is described that allows you to test free fall with a cup of water. Part of a larger presentation on roller...
University of Minnesota
The Physics of Flight: Bernoulli's Principle
Discusses air flow around the wing of a plane and its effect upon the lift and drag forces. Focuses on the application of Bernoulli's principle to wing design and the subsequent airfoil shapes.
Georgia State University
Georgia State University: Hyper Physics: Circular Orbit
The necessity of gravitation to a circular orbit is discussed and equations for the orbital speed are derived from the law of universal gravitation. Binary systems in which two objects orbit about a center of mass are explained and...
Georgia State University
Georgia State University: Hyper Physics: Gravity
Gravity as a fundamental force is explained and an equation for universal gravitation is given.
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.
Cornell University
Cornell University: Astronomy: Orbital Motion and Kepler's Laws
At this site from the Astronomy Department of Cornell University, Kepler's three laws of planetary motion are stated. There are brief explanations of each, along with links to additional information on related subjects.
National Council of Teachers of Mathematics
The Math Forum: Mass vs. Weight
This site gives an explanation that distinguishes mass from weight. It distinguishes between the two types of mass (inertial and gravitational), and gives the equations for computing both.
Other
Fear of Physics: Roller Coaster
Use animation and other interactive strategies to help understand physics principles. Change the track and height to see if your ball can make it to the end.
Ducksters
Ducksters: Earth Science for Kids: Ocean Tides
Did you know the rising and falling of the sea level is caused by the gravity of the Moon and the Sun? Kids learn about ocean tides including tidal currents and types of tides on this site.
BBC
Bbc Science & Nature: Black Holes and Time Travel
This article describes how black holes may provide clues to the possibility of time travel and parallel universes.
BBC
Bbc Newsround: Astronauts Congratulate Gravity Film From Iss
Article and video report on astronauts aboard the International Space Station offering their congratulations to the film Gravity for its Oscar success.
Other
Fermilab: What Are the Basic Forces Between Particles?
Get an introduction to the four forces that interact between atomic particles. With the help of a simulation you'll see how building reconstruction would be affected without each of the forces.
Department of Defense
Do Dea: Free Fall Constants for Earth
When you work with equations that show position, velocity, acceleration of objects that are flying or falling through the air, you will be using the constant that is the acceleration due to gravity. View formulas, explanations, and...
Science4Fun
Science4 Fun: Gravity
Peruse this resource to learn about gravity, its importance, the Universal Law of Gravitation, the difference between mass and weight, and more fun facts.
Science4Fun
Science4 Fun: Acceleration
What is acceleration? Brief article discusses how it is measured, deceleration, and gravity.
Science4Fun
Science4 Fun: Mass and Weight
What is mass? What is weight? Illustrated discussion of mass and weight including how they are measured.