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PHY221 Ch13: Collisions, Impulse and Ref. Frames

PHY221 Ch13: Collisions, Impulse and Ref. Frames. Recall main points: Speed relation for elastic collisions. Helps solve some problems: Definition of impulse and average force on one of the objects during any collision: General expression for Kinetic energy: Discussion and examples

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PHY221 Ch13: Collisions, Impulse and Ref. Frames

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  1. PHY221 Ch13: Collisions, Impulse and Ref. Frames • Recall main points: • Speed relation for elastic collisions. Helps solve some problems: • Definition of impulse and average force on one of the objects during any collision: • General expression for Kinetic energy: • Discussion and examples • Nothing special

  2. PHY221 Ch13: Collisions, Impulse and Ref. Frames Main Points Proof: relative speed remains the same before /after collision:

  3. PHY221 Ch13: Collisions, Impulse and Ref. Frames Main Points • Impulse definition and expression in terms of average force on object during collision

  4. PHY221 Ch13: Collisions, Impulse and Ref. Frames Main Points • Proof: Kinetic Energy expression: • (F=lab for instance) Prelim #1: Prelim #2 for any mass mi : Now we compute

  5. PHY221 Ch13: Collisions, Impulse and Ref. Frames EXERCISES

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