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Refer sites:

http://en.wikipedia.org/wiki/Force

http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces

http://www.physicsclassroom.com/class/newtlaws/Lesson-2/The-Meaning-of-F...

http://www.technologystudent.com/forcmom/force1.htm

http://education-portal.com/academy/lesson/force-definition-and-types.html

http://sciencepark.etacude.com/particle/forces.php

http://csep10.phys.utk.edu/astr162/lect/cosmology/forces.html

http://en.wikipedia.org/wiki/Fundamental_interaction

http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html

http://www.physlib.com/four_forces.html

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