Meet the Universe's Main Attraction...Gravity
How to Make a Gravity Painting Curiodyssey.org
What is Gravity? SpacePlace NASA
Gravity for Kids CoolFactsKids
Physics for Kids - Gravity Ducksters
Gravity European Space Agency
Defining Gravity - Crash Course Kids #41 CrashCourseKids
Gravity Experiments for Kids
Facts About Gravity ScienceWithKids
Simulations and Interactives:
PhET University of Colorado -Boulder:
Gravity and Orbits
Gravity Force Lab
Gravity Force Lab: Basics
Videos: