2019年最新-Dynamics-NorthernIllinoisUniversity：动力学-北伊利诺斯大学-精选文档

1、Dynamicsthe motion only.Kinematic Vectors宿 Kinematic quantities refer toPositionVelocityAccelerati on馥 Kinematic vectors of velocity and acceleration are coplanar.Force and MassV=rfvP=FaAQ B叫aBTwo particles can in flue nee each other.Masses related to accelerati onsMomentum is defined be mass and ve

2、locity. t Derivative is forceDefines equations of motion席 There is a net force on each particle in an object.宿 This corresponds to the particle's accelerati on.席 For N particles in a systemthe forces add.Particles of constant massSome forces are internal and some are external to the system.Inter

3、 nal forces can celCenter of Mass席 The weighted average of the positions of the particles is the center of mass.锻 The system acts like a single particle.Force at center of massTranslational change at center of mass£ （加历）Sliding Inclined Plane/X席 The block and inclined plane are both free to mov

4、e.Two fricti on less surfaces躍 The coordinates should point along the surface.Normal force is the force of constraintThe motion will be along the surfaceAcceleration from plane and block relative to plane席 The inclined plane has twoforces from constraints.Upward from table Reaction from block锻 The system of linear equations are solved for the accelerations.A_gsii&o 矽Newtonian Meeh席 The result compares to the simple problem of a fixed plane.復 There were four unknowns in the problem.Two accelerationsTwo force