8.7.1 Gravity

CK12.org Reading (2.1 Gravity in the Solar System, 2.2 Acceleration Due to Gravity)

Simulation #1: http://www.science-animations.com/support-files/freefall.swf

Simulation #2: http://phet.colorado.edu/sims/html/gravity-force-lab/latest/gravity-force-lab_en.html
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