Dynamics_Hibbeler_CH19_3

# Dynamics_Hibbeler_CH19_3 - CONSERVATION OF MOMENTUM Todays...

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CONSERVATION OF MOMENTUM Today’s Objectives : Students will be able to: 1. Understand the conditions for conservation of linear and angular momentum. 2. Use the condition of conservation of linear/ angular momentum. In-Class Activities : Check Homework Reading Quiz Applications Conservation of Linear and Angular Momentum Concept Quiz Group Problem Solving Attention Quiz

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READING QUIZ 1. If there are no external impulses acting on a body _____________. A) only linear momentum is conserved B) only angular momentum is conserved C) both linear momentum and angular momentum are conserved D) neither linear momentum nor angular momentum are conserved 2. If a rigid body rotates about a fixed axis passing through its center of mass, the body’s linear momentum is __________. A) constant B) zero C) m v G D) I G ϖ
APPLICATIONS A skater spends a lot of time either spinning on the ice or rotating through the air. To spin fast, or for a long time, the skater must develop a large amount of angular momentum. If the skater’s angular momentum is constant , can the skater vary her rotational speed? How? The skater spins faster when the arms are drawn in and slower when the arms are extended. Why?

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APPLICATIONS (continued) Conservation of angular momentum allows cats to land on their feet and divers to flip, twist, spiral and turn. It also helps teachers make their heads spin!
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## This note was uploaded on 08/29/2010 for the course EGN 3321 taught by Professor Nohra during the Spring '10 term at University of South Florida.

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Dynamics_Hibbeler_CH19_3 - CONSERVATION OF MOMENTUM Todays...

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