Physics Classroom
The Physics Classroom: Finding Individual Forces
Explore the world of finding individual forces. "The process of determining the value of the individual forces acting upon an object involve [sic] an application of Newton's Second law and an application of the meaning of the net force."
US Geological Survey
U.s. Geological Survey: Search Earthquake Catalog
Use this interactive map to find out about earthquakes which have happened around the world since about 1970.