PHY 102 1st Edition Lecture 10 Outline of Last Lecture I Blue Book II Motion III Wood block experiment IV Galileo s first law of motion Outline of Current Lecture I First law of motion continued II Blue Book Current Lecture I First law of motion continued a Galileo s discovery of a persistent motion on an infinitely smooth surface was later generalized to all undisturbed motions b The vague notion of persistence was later made precise by introducing the concept of momentum c The momentum of an isolated system does not change i Like motion itself momentum has a direction so it is a vector ii Different parts of a system can have different momenta iii An isolated system can internally break up into pieces or combine into a single piece without affecting the total momentum iv Example 1 bullet penetrates stationary block and they move with the same momentum together 1 Speed and momentum are different v Example 2 Two stationary blocks with an internal force that makes them separate has 0 momentum because they cancel each other out 1 The ratio of the two masses is the inverse ratio of speeds a The heavier block is going to move slower but have the same momentum vi m1 m2 v2 v1 OR m1v1 m2v2 vii p mv 1 p momentum a unit kg m s These 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 problem
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