Head to PBS Learning Media for a great QuickTime video and some background information on centripetal force, courtesy of the PBSKids program ZOOM.
If you are a bit fuzzy on Newton's and Einstein's theories of gravity, this short video from NOVA explains it clearly.
Gravity Lesson Plans!
HotChalk has a great lesson plan for understanding gravity similar to the experiment that Galileo did from the Leaning Tower of Pisa.
Bright Hub Education offers a lesson plan titled, "An Experiment on the Center of Gravity." Kids can compete against adults and win at these activities. Fun activity for your class.
Check out this lesson on the forces of gravity from Utah Educational Network.
PowerPoints on Gravity
Need a PowerPoint on gravity? Here are some great resources.
Birds and Gravity
Teachers will want to check out this site for detailed illustrations and information on how birds fly.
Learner.org offers "How Birds Fly: An In-Depth Journey North Lesson."
Balloons Balloons Balloons!
Helium balloons are always a fascination to kids. This PDF on helium balloons and the physics of floating in air can be the focal point of the next science experiment in your classroom.
Grab a hot air balloon lesson plan. Fun, Fun, Fun!