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L21_phys131_5nov07

# L21_phys131_5nov07 - of the object ball The ratio of speed...

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Summary for Lecture 21 on November 5, 2007 Impulse J and Momentum P i t t f i n 1 i i SYS P P dt F J v m P f i - = = = Conservation of momentum: If impulse J is zero, then i f P P = even if mechanical energy isn’t conserved!

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HARD PROBLEM : a cue ball hits an object ball. After the collision, the cue ball’s motion is at a 90° angle to the motion
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Unformatted text preview: of the object ball. The ratio of speed of the cue ball after the collision and the object ball is . What is the ratio of the velocity between the initial and final speed of the cue ball? All balls have the same mass. 3 : 1 Cue ball...
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L21_phys131_5nov07 - of the object ball The ratio of speed...

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