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This 1 page Study Guide was uploaded by Usman Qureshi on Wednesday November 18, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 16 views.
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Date Created: 11/18/15
3 Last Lecture 32D collisions 3Today 3Power Impulse Center of Mass 3Experiment 5 3 Important Concepts 3Momentum changes due to external forces acting over a period of time called impulse 3Power is change in energy over time 3Center of mass and momentum are closely related 801 L Fall 2005 11152005 Important Reminders 3 Pset 8 due this Friday 3Problem Solving session in class this Friday 3MasteringPhysics due next Monday 3My apologies for the confusion inadvertently caused by posting the next MasteringPhysics assignment early 3NOTE Class grading guidelines clearly allow discussion of MasterPhysics problems but also clearly prohibit directly working together or copying the answers of other students 801 L Fall 2005 11152005 Impulse 3Just the change in momentum A13 Jth 3Note the vectors 3The change in momentum can be used to find information about the force if the time is known 3f force and time are known the change in momentum can be calculated 801 L Fall 2005 11152005 Power 3Power is change in energy per unit time dE Power dt 3A concept that has enormous technological impact but very little utility in solving problems 30ne interesting result Power delivered by a given force increases with velocity in the force direction Power F 17 801 L Fall 2005 11152005 Center of Mass 3Definition RCM394 TOT 3As with all vectors components are the only way to do a quantitative calculation xCM 4 2mg TOT 3The positions velocities and accelerations as well as FzMa and other equations we have been studying up to now apply exactly to the center of mass of an extended object 801 L Fall 2005 11152005 Center of Mass Velocity d d 3Definition 17 R 2 m F CM CM MTOTE zdt z 1 mizy 7 wTOTE l l MTOTEPZ 3Connection to momentum MTOTVCM Zpi pTOT 380 if momentum is conserved the velocity of the center of mass is constant 801 L Fall 2005 11152005
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