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Unformatted text preview: 1 Physics 1D03 Momentum Newtons original quantity of motion a conserved quantity a vector Serway 9.1 9.3-momentum and impulse-Newtons Second Law in another form Today: Practice problems: Chapter 9, problems 1, 11, 15, 17 Physics 1D03 (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 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: ( Note we are adding vectors .) p m v 2 Physics 1D03 dt ) v d(m dt v d m a m F r r r r = = = dt p d F r r = 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.where the mass is not constant....
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