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Lecture20Notes

# Lecture20Notes - Physics 121 April 3 2008 Equilibrium and...

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1 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121, April 3, 2008. Equilibrium and Simple Harmonic Motion. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. April 3, 2008. Course Information Topics to be discussed today: Requirements for Equilibrium (a brief review) Stress and Strain Introduction to Harmonic Motion Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Physics 121. April 3, 2008. Homework set # 7 is due on Saturday morning, April 5, at 8.30 am. This assignment has two components: WeBWorK (75%) Video analysis (25%): you can calculate the angular momentum quickly by using the expression for the vector product in terms of the components of the individual vectors (the x and y components of the position and velocity of the puck). Homework set # 8 is now available. This assignment contains only WeBWorK questions and will be due on Saturday morning, April 12, at 8.30 am. Exam # 3 will take place on Tuesday April 22.

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2 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Comments on Homework # 7. Rolling motion causes much confusion! Two views of rolling motion: 1) Pure rotation around the instantaneous axis or 2) rotation and translation. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Comments on Homework # 7. Rolling motion causes much confusion! Note: friction provides the torque with respect to the center-of-mass. Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Homework # 8. Due: Saturday April 12, 2008. All problems in this assignment are related to equilibrium. In all cases you need to identify all forces and torques that act on the system. Remember to choose the reference point in a smart way!
3 Frank L. H. Wolfs Department of Physics and Astronomy, University of Rochester Equilibrium (a quick review). An object is in equilibrium is the following conditions are met: Net force = 0 N ( frst condition for equilibrium) . This implies p = constant. and

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Lecture20Notes - Physics 121 April 3 2008 Equilibrium and...

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