PBS
Pbs Learning Media: Why Doesn't the Moon Fall Down?
In this animated video segment adapted from NASA, astronomer Doris Daou explains how the forces of speed and gravity keep the moon in a constant orbit around Earth. [1:36]
NOAA
Noaa: Satellites in Orbit [Pdf]
Construct a model that helps to show how satellites stay in orbit around the Earth. Then see how a flashlight can help explain how a satellite can send messages to different locations.