Scholastic
Scholastic: Study Jams! Science: Our Solar System: Gravity & Inertia
A video and a short multiple-choice quiz on the topic of gravity and inertia, and how they work together to keep objects from floating off into space.
Physics4kids
Physics4 kids.com: Forces of Attraction
Several diagrams provide explanations of planetary gravity as well as the gravity that exists between all objects.
NASA
Nasa: The Space Place: What Is Gravity Really?
What is known about gravity? Find out Einstein's thoughts on gravity in a brief overview of this mysterious force.
Cosmos 4 kids
Cosmos4 Kids: Force of Gravity
Learn about the force of gravity in this article. Also, view a video that shows angry birds and pigs go weightless!
The Wonder of Science
The Wonder of Science: 5 Ps2 1: Earth's Gravitational Force
Create lessons on Earth's gravitational force with this site that includes work samples, phenomena, assessment templates, and videos.
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?
Ducksters
Ducksters: Physics for Kids: Gravity
Kids learn about the science behind gravity, the mysterious force of planet earth including why it is important, what is weight, and fun facts. What is gravity?
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Gravity?
Investigate what keeps us grounded and who spent a lot of time studying its details. How does gravity impact plant growth?