lecture20_09 - Phy 2053 Announcements 1. Reitze and Chan...

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1 Phy 2053 Announcements 1. Reitze and Chan still away attending scientific conferences this week ± American Physical Society March Meeting ± http://www.aps.org/meetings/march/index.cfm ± Laser Interferometer Gravitational-wave Observatory Collaboration meeting ± http://www.ligo.org/ ± Office hours cancelled for this week ± Reitze will begin lecturing next week 2. Webassign HW set #8 is now available online From the last time: Torque and Equilibrium ± Torque, τ = r F ^ ± SI unit is N . m ± Conditions for equilibrium when rotation is involved ± Forces: net external force must be zero ± Torques: net external torque must be zero ± rotation counterclockwise Æ the torque is positive ± rotation clockwise Æ the torque is negative 0 00 xy or and Σ= F FF r rr 0 τ r Example of a Free Body Diagram--Ladder ± free body diagram shows normal force and force of static friction acting on the ladder at the ground L Θ ² The last diagram shows the lever arms for the forces from axis of rotation at ground ²
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This note was uploaded on 05/17/2011 for the course PHY 2053 taught by Professor Buchler during the Spring '06 term at University of Florida.

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lecture20_09 - Phy 2053 Announcements 1. Reitze and Chan...

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