Chapter 06b - Chapter 6B Collisions Momentum is conserved...

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Chapter 6B 1 Collisions Momentum is conserved during a collision. What about kinetic energy? Colliding objects may do work by deforming each other. Some kinetic energy may lost due to friction. So is kinetic energy conserved? (Rarely)
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Chapter 6B 2 Elastic and Inelastic Collisions Elastic collisions: KE is conserved (Very hard objects striking with no deformation.) Inelastic collisions: KE is not conserved (When objects stick together the least amount of KE will be conserved. These collisions are totally inelastic .)
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Chapter 6B 3 Elastic Collisions In elastic collisions, momentum is conserved: m 1 v 1 i + m 2 v 2 i = m 1 v 1 f + m 2 v 2 f and kinetic energy is conserved: 1 2 m 1 v 1 i 2 + 1 2 m 2 v 2 i 2 = 1 2 m 1 v 1 f 2 + 1 2 m 2 v 2 f 2
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Chapter 6B 4 Elastic Collisions In an elastic collision of two objects with equal masses: v 1 f = v 2 i v 2 f = v 1 i The two objects will exchange velocities.
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Chapter 6B 5 Elastic Collisions in a Game of Pool before collision after collision Motionless cue ball Moving ball v ball v cue = 0 Moving cue ball Motionless ball v cue v ball = 0
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6 Glancing Collisions Remember that momentum is a vector quantity. Momentum has both magnitude and
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Chapter 06b - Chapter 6B Collisions Momentum is conserved...

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