Chapter4MotionintwoandthreedimensionsTwoprinciplesfor2Dand3Dmotions:1)Theprincipleofindependenceofforce2)TheprincipleofsuperpositionofmotionF1F2F3Theparticlestartsatt=0withinitialpositionandaninitialvelocity.Section4-1MotioninthreedimensionswithconstantaccelerationNowweconsideraparticlemoveinthreedimensionswithconstantacceleration.Wecanrepresenttheaccelerationasavector:→++=kajaiaazyx→++=kzjyixro000→++=kvjvivvzyx0000Inasimilarway:tavvxxx+=0tavvyyy+=0tavvzzz+=0tavv→→→+=0aconstant,a→,,,xyzaaaallconstantstavxxxtx20021++=tavzzztz20021++=tavyyyty20021++=20021tatvrr→→→→++=（4-1）（4-2）Section4-2Newton’slawsinthreedimensionalvectorf...
