Lecture_16_web2007

Lecture_16_web2007 - Midterm prep Check the room and place...

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Unformatted text preview: Midterm prep Check the room and place number on the web Dont forget your id Check web later today for makeup room and time Check review slides online already Work on the old midterm Go to help centre or come and see me F ( 29 cos F d d F = ( 29 cos F =the component of F in the d direction Work and energy ( 29 W=Fcos d The unit of work =Newton meter =Joule This is a measure of energy F d The work to move a mass up an incline n g Mg = F + v e y + v e x cos( ) Mg sin( ) Mg What is the work done to push a mass a distance d up a frictionless incline without accelerating it? x F Ma = = sin( ) Mg F - = sin( ) F Mg = W = F.d sin( ) W dMg = h sin( ) h d = W Mgh = The work done depends only on h The work can be retrieved and is called potential energy Conservative forces Conservative force: A force in which the work done in getting from A to B is independent of the path Gravity is a conservative force A B Kinetic Energy and net work F x f W F x = F Ma = 2 2 2 f a x = + 2 2 2 f a x - = 2 2 2 f F M x - = 2 2 1 1 2 2 f F x M M =- 2 1 2 M = Kinetic energy Net force 2 2 2 f a x =- Relationship between Work and Kinetic energy F x f net f W KE KE =- 2 2 1 1 2 2 f F x M M =- F x = net work net W KE = F...
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Lecture_16_web2007 - Midterm prep Check the room and place...

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