Dynamics_Hibbeler_CH19_1and2

Dynamics_Hibbeler_CH19_1and2 - Todays Objectives: Students...

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LINEAR AND ANGULAR MOMENTUM, PRINCIPLE OF IMPULSE AND MOMENTUM Today’s Objectives : Students will be able to: 1. Develop formulations for the linear and angular momentum of a body. 2. Apply the principle of linear and angular impulse and momentum . In-Class Activities : Check Homework Reading Quiz Applications Linear and Angular Momentum Principle of Impulse and Momentum Concept Quiz Group Problem Solving Attention Quiz
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READING QUIZ 1. The angular momentum of a rotating two-dimensional rigid body about its center of mass G is ___________. A) m v G B) I G v G C) m ϖ D) I G ϖ 2. If a rigid body rotates about a fixed axis passing through its center of mass, the body’s linear momentum is __________. A) a constant B) zero C) m v G D) I G ϖ
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APPLICATIONS What are the benefits of making the bridge with the variable depth (thickness) substructure as shown? The swing bridge opens and closes by turning using a motor located under the center of the deck at A that applies a torque M to the bridge. If the bridge was supported at its end B, would the same torque open the bridge in the same time, or would it open slower or faster?
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APPLICATIONS (continued) As the pendulum rotates about point O, what is its angular momentum about point O? As the pendulum of the Charpy tester swings downward, its angular momentum and linear momentum both increase. By calculating its momenta in the vertical position, we can calculate the impulse the pendulum exerts when it hits the test specimen.
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APPLICATIONS (continued) If only engine A is fired, about which axis does the shuttle tend to rotate? The space shuttle has several engines that exert thrust on the shuttle when they are fired. By firing different engines, the pilot can control the motion and direction of the shuttle.
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Dynamics_Hibbeler_CH19_1and2 - Todays Objectives: Students...

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