Dynamics_Hibbeler_CH15_5and7

Dynamics_Hibbeler_CH15_5and7 - ANGULAR MOMENTUM, MOMENT OF...

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ANGULAR MOMENTUM, MOMENT OF A FORCE AND PRINCIPLE OF ANGULAR IMPULSE AND MOMENTUM Today’s Objectives : Students will be able to: 1. Determine the angular momentum of a particle and apply the principle of angular 2. Use conservation of angular momentum to solve problems. In-Class Activities : Check Homework Reading Quiz Applications Angular Momentum Angular Impulse and Momentum Principle Conservation of Angular Momentum Concept Quiz Group Problem Solving Attention Quiz

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READING QUIZ 1. Select the correct expression for the angular momentum of a particle about a point. A) r × v B) r × (m v ) C) v × r D) (m v ) × r 2. The sum of the moments of all external forces acting on a particle is equal to A) angular momentum of the particle. B) linear momentum of the particle. C) time rate of change of angular momentum. D) time rate of change of linear momentum.
APPLICATIONS Planets and most satellites move in elliptical orbits. This motion is caused by gravitational attraction forces. Since these forces act in pairs, the sum of the moments of the forces acting on the system will be zero. This means that angular momentum is conserved. If the angular momentum is constant, does it mean the linear momentum is also constant? Why or why not?

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APPLICATIONS (continued) The passengers on the amusement-park ride experience conservation of angular momentum about the axis of rotation (the z-axis). As shown on the free body diagram, the line of action of the normal force, N, passes through the z-axis and
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Dynamics_Hibbeler_CH15_5and7 - ANGULAR MOMENTUM, MOMENT OF...

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