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= = 4.1 **Work**

Energy is the ability to do __work!__ Work is done whenever there is a change or transfer of energy


 * Work : ( mechanical work)**

Direction as the displacement

W= F **.** d ( dot product of the force and displacement vectors)

Product of the magnitude of the force and the magnitude of the displacement in the direction of the force

W = /F/ /d/ cos

F – magnitude of the force /F/ d – magnitude of the displacement L - angle between the F and d W – work done…….W is scalar

= [N] [m] = N.M
 * Units** – W = /F/ /d/ cos

1N.M = 1 Joule =1 J http://www.youtube.com/watch?v=2WS1sG9fhOk