Lecture16Notes(Broken Computer)

Lecture16Notes(Broken Computer) - 1 Frank L. H. Wolfs...

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Unformatted text preview: 1 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. March 20, 2008. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. March 20, 2008. • Course Information • Quiz • Topics to be discussed today: • Rotational Variables (Review) • Torque • Rolling Motion • Review for Exam 2 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. March 20, 2008. • Homework set # 6 is now available on the WEB and will be due on Saturday morning, March 22, at 8.30 am. • There will be no homework due on March 29. • Exam # 2 will take place on Tuesday March 25 at 8 am in Hubbell. It will cover the material discussed in Chapters 7, 8, and 9. • There will be no workshops or ofFce hours on Tuesday - ¡riday next week. • Extra ofFce hours will be scheduled for Sunday 3/23 and Monday 3/24. 2 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. Quiz lecture 16. • The quiz today will have 3 questions! Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Rotational variables. A quick review. • The variables that are used to describe rotational motion are: • Angular position θ • Angular velocity ω = d θ /dt • Angular acceleration α = d ω /dt • The rotational variables are related to the linear variables: • Linear position l = R θ • Linear velocity v = R ω • Linear acceleration a = R α Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Rotational variables. A quick review. • Things to consider when looking at the rotation of rigid objects around a Fxed axis: • Each part of the rigid object has the same angular velocity. • Only those parts that are located at the same distance from the rotation axis have the same linear velocity. • The linear velocity of parts of the rigid object increases with increasing distance from the rotation axis. 3 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Rotational variables. A quick review. • Note: the acceleration a t = r α is only one of the two component of the acceleration of point P. The two components of the acceleration of point P are: • The radial component: this component is always present since point P carried out circular motion around the axis of rotation. • The tangential component: this component is present only when the angular acceleration is not equal to 0 rad/s 2 . Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Rotational variables. A quick review. Angular velocity and acceleration are vectors! They have a magnitude and a direction. The direction of ω is found using the right-hand rule....
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This note was uploaded on 10/20/2010 for the course PHY PHY 121 taught by Professor Wolfs during the Spring '08 term at Rochester.

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Lecture16Notes(Broken Computer) - 1 Frank L. H. Wolfs...

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