10_22_Momentum - 10/22 Momentum 0 Text: Chapter7 0...

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10/22 Momentum 0 Text: Chapter7 0 Presentation “Arrow in the Haystack” 0 HW “Energy and Momentum” Due Friday! Technically Wednesday’s HW dated 10/24 0 Peer Guides: Please keep a rough tally of the number using the Guidance Center 0 Exam II: Almost done, pickup Tuesday 0 Exam III: 11/15 Chapters 7-9 9 is rotational dynamics, 2nd law for rotation
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Arrow in the Haystack Stops in 0.1s 1m inside stack First arrow Second arrow twice as fast Can we tell what happens to the second arrow? Without the mass? What about momentum, p = mv? Energy? How many times greater is the KE i of the second arrow compared to the KE i of the first? KE i = 4 times KE i KE = 1 / 2 mv 2 v doubles KE quadruples KE i KE i How many times greater is the p i of the second arrow compared to the p i of the first? p = mv MOMENTUM IS A VECTOR! p i p i v doubles p doubles p i = 2 times p i Points the same direction as velocity ???
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Arrow in the Haystack First arrow Second arrow twice as fast How much time is required for the haystack to stop the
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10_22_Momentum - 10/22 Momentum 0 Text: Chapter7 0...

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