Kinetics of Rigid (Planar) Bodies Penn （刚性动力学(平面)的身体佩恩）.pdf

MEAM 211MEAM 211 Kinetics of Rigid (Planar) Bodies MEAM 211MEAM 211 Types of motion Rectilinear Curvilinear translation translation General planar motion Rotation about a fixed point MEAM 211MEAM 211 Kinetics of a System of Particles m i The center of mass for a system of particles accelerates in an inertial frame as if it were a single particle with r G i mass m (equal to the total mass of the system) acted upon by a force equal to the net external force. r N d v G O N F ∑Fi m r m dt r 1 ∑m r i 1 m i i i 1 The rate of change of angular The rate of change of angular momentum of the system about momentum of the system about a fixed point O is equal to the the center of mass G is equal resultant moment of all to the resultant moment of all external forces acting on the external forces acting on the system about O