Lecture18Notes

# Lecture18Notes - Physics 121 Angular Momentum Torque and...

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1 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121, March 27, 2008. Angular Momentum, Torque, and Precession. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. March 27, 2008. Course Information Quiz Topics to be discussed today: Review of Angular Momentum Conservation of Angular Momentum Precession Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. March 27, 2008. Homework set # 7 is now available and is due on Saturday April 5 at 8.30 am. Homework set # 7 has two components: WeBWork (75%) Video analysis (25%) Exam # 2 will be graded this weekend and the results will be distributed via email on Monday March 29. Make sure you pick up the results of exam # 2 in workshop next week.

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2 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Homework Set # 7. Rolling Motion. Precession. Moment of inertia. Angular acceleration. Conservation Of Angular Momentum. Conservation Of Angular Momentum. Pulley problem. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Video analysis. Is angular momentum conserved? Ruler Origin Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. Quiz lecture 18. The quiz today will have 4 questions!
3 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Angular momentum. A quick review. We have seen many similarities between the way in which we describe linear and rotational motion. Our treatment of these types of motion are similar if we recognize the following equivalence: linear rotational mass m moment I force F torque τ = r x F What is the equivalent to linear momentum? Answer: angular momentum . Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Angular momentum. A quick review. The angular momentum is deFned as the vector product between the position vector and the linear momentum. Note: Compare this deFnition with the deFnition of the torque. Angular momentum is a vector. The unit of angular momentum is kg m 2 /s. The angular momentum depends on both the magnitude and the direction of the position and linear momentum vectors. Under certain circumstances the

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Lecture18Notes - Physics 121 Angular Momentum Torque and...

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