S U M M A R YThe goal of Chapter 4 has been to learn to solve problems about motion in a plane.General PrinciplesTheinstantaneous velocityis a vector tangent to the trajectory.The instantaneous accelerationisthe component of parallel to is responsible for change of speed.the component of perpendicular to is responsible for change of direction.vr,arar',vr,arari,ar5dvr/dtvr5drr/dtRelative motionInertial reference frames moverelative to each other with constantvelocity Measurements of positionand velocity measured in frame S arerelated to measurements in frame by the Galilean transformations:yr5y2Vytvry5vy2Vyxr5x2Vxtvrx5vx2VxSrVr.Important ConceptsUniform Circular MotionAngular velocityand are constant:The centripetal acceleration points toward the center of the circle:It changes the particle’s direction but not its speed.
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