'''Energy''' (from the Greek ἐνέργεια}} - ''[[energeia]]'', "activity, operation", from ἐνεργός - ''energos'', "active, working" [http://www.etymonline.com/index.php?term=energy] is a scalar [[physical]] [[quantity]] that is an attribute of objects and systems that is conserved in nature. In physics textbooks, energy is often defined as the ability to do work or to cause change. | '''Energy''' (from the Greek ἐνέργεια}} - ''[[energeia]]'', "activity, operation", from ἐνεργός - ''energos'', "active, working" [http://www.etymonline.com/index.php?term=energy] is a scalar [[physical]] [[quantity]] that is an attribute of objects and systems that is conserved in nature. In physics textbooks, energy is often defined as the ability to do work or to cause change. |