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Unformatted text preview: Physics 1D03  Lecture 25 Momentum and Impulse Newtons original quantity of motion a conserved quantity a vector Serway & Jewett 9.1 9.3 Newtons Second Law in another form momentum and impulse Today: Physics 1D03  Lecture 25 (We say linear momentum to distinguish it from angular momentum , a different physical quantity.) Definition: The linear momentum p of a particle is its mass times its velocity: Momentum is a vector , since velocity is a vector. Units: kg m/s (no special name). p m v Physics 1D03  Lecture 25 p total = p 1 + p 2 + ... = m 1 v 1 + m 2 v 2 + ... The total momentum of a system of particles is the vector sum of the momenta of the individual particles: Since we are adding vectors , we can break this up into components so that: p x,Tot = p 1x + p 2x + . Etc. Physics 1D03  Lecture 25 dt ) v d(m dt v d m a m F = = = d t p d F = Newtons Second Law If mass is constant, then the rate of change of ( m v ) is equal to m times the rate of change of v . We can rewrite Newtons Second Law: or This is how Newton wrote the Second Law. It remains true in cases where the mass is not constant....
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This note was uploaded on 11/08/2010 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Spring '09 term at McMaster University.
 Spring '09
 MCKAY
 Physics, Momentum

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