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by: Miss Lyla Rolfson
Miss Lyla Rolfson
GPA 3.7

Michael Strauss

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Michael Strauss
Class Notes
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This 8 page Class Notes was uploaded by Miss Lyla Rolfson on Monday October 26, 2015. The Class Notes belongs to PHYS 1205 at University of Oklahoma taught by Michael Strauss in Fall. Since its upload, it has received 15 views. For similar materials see /class/229269/phys-1205-university-of-oklahoma in Physics 2 at University of Oklahoma.


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Date Created: 10/26/15
Chapter 9 Impulse Momentum and Collisions Systems When dealing with conservation laws we need to de ne the system A quantity that is always conserved may still be transferred into or out of a system 0 Work was de ned as the transfer of energy into or out of the system For conservation of momentum we will need to know which forces are external or internal to the system In many cases the best choice for the system will be clear A transfer of momentum into or out of the system is called an impulse Linear Momentum p mv ZF ma m dvdt dmvdt dpdt 2F dpdt Newton s 2nd Law The rate of change of momentum of a body is proportional to the netforee applied to it This is a more general form of Newton s 2nd law for it includes both the case when mass andor velocity changes Interactive Question A rubber ball and a lump of putty have equal mass They are thrown with equal speed against a wall The ball bounces back with nearly the same speed with which it hit The putty sticks to the wall Which object experiences the greater momentum change A The ball B The putty C Both eXperience the same momentum change D Cannot be determined from the information given Interactive Question A person attempts to knock down a large wooden bowling pin by throwing a ball at it The person has two balls of equal size and mass one made of rubber and the other of putty The rubber ball bounces back while the ball of putty sticks to the pin Which ball is most likely to topple the bowling pin A the rubber ball B the ball of putty C makes no difference D need more information Consider a system of particles Let P be the vector sum of the momentum of the entire system P m1v1 mzv2 Zmivi 2pi dPdt deidt ZFi Where Fi is the net force on the ith object in the system dPdt ZFiltintgt ZFieXt O ZFiext 2F dPdt ext This is the most important equation in the chapter and is a very general principle Problems involving the conservation of momentum start here Conservation of Momentum 2F dPdt ext If the system is isolated then dPdt O The total momentum of an isolated system of bodies remains constant When ZFext 0 then Pinitial P nal39 Where P 2pi


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