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Unformatted text preview: Lecture 13 Rotational Kinematics and Dynamics Torque Physics 111, Summer 2011, July 6, Lecture 13 Summary 2 Collision : any strong interaction between two or more moving objects during relatively short period of time. After the collision: in elastic collision, objects move separately; in inelastic collision, objects stuck and move together. There is only one point of an object that moves in the same complex path that a particle would move if subjected to the same net force; this point is socalled the center of mass . The momentum of the system is conserved (Is the same after the collision as before). initial final p p = Elastic collision : The total kinetic energy of the system is the same after the collision as before: Inelastic collision : The total kinetic energy of the system after the collision is less than before: initial final KE KE = initial final KE KE < Physics 111, Summer 2011, July 6, Lecture 13 Rotational Kinematics and Dynamics Parameters which we will discuss for rotational motion: 6. Torque 7. Moment of inertia 3 8. Rotational kinetic energy 9. Angular momentum 1. Linear velocity r v 3. Radial acceleration A ball attached to the string A rigid disc 4. Angular acceleration 2. Angular velocity 5. Tangential acceleration Physics 111, Summer 2011, July 6, Lecture 13 Rotational Motion: Kinematics 4 Parameter for the motion at straight line and for rotational motion: 1. Parameters similar to those we used for the motion at straight line: Displacement Speed Acceleration 2. Parameters which are specific for rotational motion only: Period, frequency Radial acceleration f T 1 = r v a R 2 = T r v π 2 = Speed Physics 111, Summer 2011, July 6, Lecture 13 New Angular Quantity: Radians 5 The most convenient way is to measure the angle θ not in degrees, but in radians (abbreviated rad )....
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 Summer '08
 B
 Angular Momentum, Moment Of Inertia, Rotation

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