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A diagram shows a positive charge labeled Q on the left and two dashed paths from point B to point A on the right. Path 1 goes directly from B to A, while path 2 follows a route from B to C to D to A. Both paths illustrate possible ways to move a second charge q in the presence of Q.
How is energy defined and measured?
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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
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Article History

Type Description Contributor Date
Add new Web site: College of DuPage Digital Press - Conceptual Physics - Work and energy. Oct 09, 2026
Add new Web site: Physics LibreTexts - Kinetic Energy. Dec 10, 2025
Add new Web site: Physics LibreTexts - Work. Sep 04, 2025
Add new Web site: University of Central Florida Pressbooks - University Physics Volume 1 - Work and Power for Rotational Motion. Apr 17, 2025
Add new Web site: University of Illinois Urbana-Champaign - The Grainger College of Engineering - Work and Kinetic Energy (PDF). Feb 10, 2025
Add new Web site: MIT OpenCourseWare - Work and Energy (PDF). Feb 06, 2025
Add new Web site: Kwantlen Polytechnic University - Foundations of Physics - Power, Work and Energy. Sep 23, 2024
Add new Web site: King Abdulaziz University - Kinetic Energy and Work. Sep 09, 2024
Add new Web site: The Ohio State University - College of Arts and Sciences - Kinetic Energy and Work. Jul 30, 2024
Add new Web site: Khan Academy - What are energy and work? May 03, 2024
Add new Web site: Boston University - Arts and Sciences - Work and energy. Dec 29, 2023
Add new Web site: BCCampus Publishing - Work. Nov 03, 2023
Add new Web site: University of Iowa Pressbooks - Work: The Scientific Definition. Aug 10, 2023
Add new Web site: OpenStax - University Physics Volume 1 - Work. Oct 06, 2022
Article revised and updated. May 12, 2020
Add new Web site: NeoK12 - Educational Videos and Games for School Kids - Energy and Work. Nov 02, 2011
Added new Web site: FortuneCity - Work and Energy. May 27, 2008
Added new Web site: Momentum, Work, and Energy. May 31, 2006
Added new Web site: Momentum, Work, and Energy. May 31, 2006
Article added to new online database. Jul 20, 1998
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