# Lect15 - Physics 101 Lecture 15 Pg 1 Physics 101 Physics...

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Unformatted text preview: Physics 101: Lecture 15, Pg 1 Physics 101: Physics 101: Lecture 15 Lecture 15 Impulse and Momentum Impulse and Momentum ● Today’s lecture will be a review of Chapters 7.1 - 7.2 and ● New material: Collisions and Center of Mass, Chapters 7.3-7.5 Rotational Motion and Angular Displacement, Chapter 8.1 Physics 101: Lecture 15, Pg 2 Conservation of Linear Momentum Conservation of Linear Momentum ● Consider a system of two colliding objects with masses m 1 and m 2 and initial velocities v 01 and v 02 and final velocities v f1 and v f2 : If the sum of the average external forces acting on the two objects is zero ( = isolated system), the total momentum of the system is conserved: Σ F ave,ext ∆ t = P f - P => P f = P if Σ F ave,ext = 0 P f and P o are the total momenta of the system: P f = p f1 + p f2 and P = p 01 + p 02 This is true for any number of colliding objects. Physics 101: Lecture 15, Pg 3 Applying the Principle of Momentum Applying the Principle of Momentum Conservation...
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Lect15 - Physics 101 Lecture 15 Pg 1 Physics 101 Physics...

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