8 25.3 consequences of Einstein's postulates Prove by contradiction: Make the hypothesis that a moving stick oriented perpendicular to the direction of motion is longer than stick at rest. An observer in reference frame s: lo rulers at rest in s 8 25.3 consequences of Einsteins postulates An observer in reference frame S l Measured using >lo rulers at rest in Measured using rulers at rest in S The two observer can compare their conclusions by communication, and find the results are contradictory, therefore, the hypothesis must be false17 Prove by contradiction: Make the hypothesis that a moving stick, oriented perpendicular to the direction of motion, is longer than stick at rest. An observer in reference frame S: 0 l > l x′ y′ o′ Measured using rulers at rest in S’ 0l x y o Measured using rulers at rest in S §25.3 consequences of Einstein’s postulates An observer in reference frame S’: 0 l > l x′ y′ o′ Measured using rulers at rest in S’ 0l x y o Measured using rulers at rest in S The two observer can compare their conclusions by communication, and find the results are contradictory, therefore, the hypothesis must be false. §25.3 consequences of Einstein’s postulates