PHY 102 1st Edition Lecture 10Outline of Last Lecture I. Blue BookII. MotionIII. Wood block experimentIV. Galileo’s first law of motionOutline of Current Lecture I. First law of motion (continued)II. Blue BookCurrent LectureI. First law of motion (continued)a. Galileo’s discovery of a persistent motion on an infinitely smooth surface was later generalized to all undisturbed motionsb. The vague notion of “persistence” was later made precise by introducing the concept of momentumc. The momentum of an isolated system does not changei. Like motion itself, momentum has a direction, so it is a vectorii. Different parts of a system can have different momentaiii. An isolated system can internally break up into pieces or combine into a single piece without affecting the (total) momentumiv. Example 1: bullet penetrates stationary block and they move with the same momentum (together)1. Speed and momentum are differentv. Example 2: Two stationary blocks with an internal force that makes them separate has 0 momentum because they cancel each other out1. The ratio of the two masses is the inverse ratio of speedsa. The heavier block is going to move slower, but have the same momentumvi. m1/m2 = v2/v1 OR m1v1 = m2v2vii. p = mv1. p = momentuma. unit = kg*m/sThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.II. Blue Book 5.1 #7, 8, 5.2 astronaut
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