12_13_Momentum_Review

# 12_13_Momentum_Review - What’s the plan Which concepts...

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12/13 Review 2 Presentation “The Double Ballistic Pendulum” 2 Final Exam Tuesday 12/18, 8-10 am, Wit 116 150 total points but weighted as two regular 100 point exams 2 Review Guide on web 2 Peer Guide today 2-4 in Witmer 115 2 Be sure to turn in your last lab!!!

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A arrow of mass m strikes and sticks in a soft pendulum bob at rest, also of mass m. v m m h The bob and arrow swing up to a height h the swing back down. Upon arriving back at the lowest point, a second arrow with the same mass and velocity as before, strikes and sticks in the bob. Find h and after the first arrow and what happens after the second.
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Unformatted text preview: What’s the plan? Which concepts and when? momentum 1st arrow collision: Swing up: Swing down: 2nd collision: energy energy momentum v m m 1st collision: Draw what? p sys or ∆ p ? Well, don’t know p f of either so. .. p sys,i = p sys,f = ? mv mv = Both m’s moving with the same new v which is. .. mv = 2mv f v/2 h K g g K mgh = 1 / 2 mv f 2 h = v 2 8g Now what happens? What’s the p of the returning bob and arrow? What’s the p of the second arrow? mv mv p sys = 0!!! v f = v/2...
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12_13_Momentum_Review - What’s the plan Which concepts...

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