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# lecture+notes+22 - 14:440:222 Dynamics(Lecture Note#22...

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14:440:222 Dynamics (Lecture Note #2 2 ) Instructor: Prof. Peng Song Rutgers University

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Today’s Lecture • Work and energy for rigid body motion
If the motor gear characteristics are known, how would you find the rotational velocity of the mixing drum? The work of the torque (or moment) developed by the driving gears on the two motors on the concrete mixer is transformed into the rotational kinetic energy of the mixing drum. Applications

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Are the kinetic energies of the frame and the roller related to each other? If so, how? The work done by the soil compactor's engine is transformed into the translational kinetic energy of the frame and the translational and rotational kinetic energy of the roller and wheels (excluding the internal kinetic energy developed by the moving parts of the engine and drive train). Applications (cont’d)
sum of its translational and rotational kinetic energies. In equation form, a body in general plane motion has kinetic energy given by: T = 1/2 m (v G ) 2 + 1/2 I G ω 2 Several simplifications can occur. 1. Pure Translation: When a rigid body is subjected to only curvilinear or rectilinear translation, the rotational kinetic energy is zero ( ω = 0). Therefore,

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## This document was uploaded on 10/31/2011 for the course ENG MECH 232 at Rutgers.

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lecture+notes+22 - 14:440:222 Dynamics(Lecture Note#22...

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