General Reference Sources
scienceworld.wolfram.com
The author of science world is Eric Weisstein and cites authoritive science references for all the entries in the encyclopedia.
Link: http://scienceworld.wolfram.com/physics/ _______________________________
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Thefreedictionary.com
Thumbnail courtesy of The FREE DICTIONARY
'Thefreedictionary' cross references credible sources of information from 'The American Heritage Dictionary of the English Language, the 'Columbia Encyclopedia, the 'computer desktop Encyclopedia and the Hutchinson Encyclopedia. This combined dictionary and thesaurus source can be used in this pathfinder to further their understanding of technical terms to enrich their vocabulary in the study of 'Projectile Motion'.
Link: http://www.thefreedictionary.com or click on image --------------------------------------------
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