# lecture27 - Collisions Conservation of Momentum Elastic and...

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1 Physics 1D03 - Lecture 26 1 Serway 9.3 - 9.4 Collisions • Conservation of Momentum • Elastic and inelastic collisions For practice: Chapter 9, problems 15, 17, 21, 24, 33 Physics 1D03 - Lecture 26 2 dt d p F = Impulse (a vector) is defined as F Δ t (for a constant force), or in general. dt F or (change in p) = (total impulse from external forces) Newton’s Second Law again: Momentum: p = m v

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Physics 1D03 - Lecture 26 3 Momentum Conservation F 1 F 2 = - F 1 m 1 m 2 Newton’s 3 rd Law: F 2 = - F 1 leads to the Law of Conservation of Momentum: The total momentum ( vector sum) of all the particles in a system remains constant if there are no external forces acting on the system. Physics 1D03 - Lecture 26 4 Example: roller basketball A (stationary) 100-kg basketball player on roller skates shoots a 1-kg basketball horizontally at a speed of 10 m/s. What happens (if there is no friction)? Is momentum still conserved after an opponent
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## This note was uploaded on 01/13/2011 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Fall '09 term at McMaster University.

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lecture27 - Collisions Conservation of Momentum Elastic and...

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