ME 3133 Chapter : Lect 06 Part Kin RELATIVE MOTION BLANKS
Document Summary
Quiz #01 today after lecture: topics for the day. Particle kinematics: aside: vectors follow parallelogram law of addition & subtraction. Careful: don"t mix & confuse vector & scalar notations & math. Common mistakes: o dropping the vector notation (a a) o adding vectors & scalars (6i + 5 11) o dividing by vectors (5 10i / 2i ) Particle kinematics: relative motion: inertial reference frame (i,j) (cid:3)fixed(cid:1) coordinate frame: movement negligible w. r. t. problem under consideration, e. g. earth for most engineering but not for interplanetary travel, moving coordinate frame a. Often simpli es motion studies of particle or rigid body: fixed particle path constraint known w. r. t. moving body. Sometimes the only alternative as measurements are not possible in a xed frame of reference. For now, examine translating axes only: like a gyroscopic reference frame on moving object, later we will generalize to rotating-translating axes. Clearly specify coordinate frames in resolving problems! O ra & rb or ra/o & rb/o.
