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# lecture+notes+21 - 14:440:222 Dynamics(Lecture Note#21...

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14:440:222 Dynamics (Lecture Note #2 1 ) Instructor: Prof. Peng Song Rutgers University

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Today’s Lecture • Planar kinetics of rigid body: General planar motion
As the soil compactor accelerates forward, the front roller experiences general plane motion (both translation and rotation). The forces shown on the roller’s FBD cause the accelerations shown on the kinetic diagram. Is the point A the IC? = What are the loads experienced by the roller shaft or bearings? Applications

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The lawn roller is pushed forward with a force of 200 N when the handle is at 45°. How can we determine its translation acceleration and angular acceleration? Does the acceleration depend on the coefficient’s of static and kinetic friction? Applications (cont’d)
When a rigid body is subjected to external forces and couple-moments, it can undergo both translational motion and rotational motion. This combination is called general plane motion. F x = m (a G ) x F y = m (a G ) y M G = I G α Using an x-y inertial coordinate system, the equations of motions about the center of mass, G, may be written as: Equations of Motion: General Plane Motion

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lecture+notes+21 - 14:440:222 Dynamics(Lecture Note#21...

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