Force of Gravity

Why does gravity cause things to fall?:
Drop a tennis ball off of various objects to explore how things fall due to gravity.
http://www.fearofphysics.com/Fall/fall.html

Law of Universal Gravitation:
Adjust the distance of the rocket from the surface of the earth to see differences in the force of gravity as it goes farther away from the earth.
http://www.randomnity.com/flash/nick.swf

More Universal Gravitation:
Explore the variables that affect the force of gravity between an object and a planet. Move the object around with desired masses.
http://www.glenbrook.k12.il.us/gbssci/phys/shwave/gravitn.html

Gravitational force:
Based on Newton's third law, this site explores the gravitational forces exerted between two objects. The mass of each object can be adjusted.
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=411

The Elevator to the moon:
This site shows that in ??apparent weightlessness??, there actually is weight when calculated by the formula F = mg. The elevators' flight can be played and viewed in steps.
http://physics.k12albemarle.org/teacher/Gravity/weightless/weightlessness3.swf


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