Lect09

# Lect09 - PHYS 172: Modern Mechanics Spring 2012 EXAM 1...

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Spring 2012 PHYS 172: Modern Mechanics EXAM 1 tomorrow Time: 8:00-9:30 pm tomorrow (Wed Feb 8) Place: Elliott Hall aterial: lectures 1 , HW 1 , Recitations 1 , Labs 1 Lect. 9 - Rate of Change of Momentum, Energy Read 5.4-5.7, 6.1-6.2 Material: lectures 1-8, HW 1-8, Recitations 1-4, Labs 1-4 Problems: multiple choice, 10 questions (70 points) write-up part, hand graded (30 points) Equation sheet: provided with exam Practice exam + equation sheet: have been posted over the weekend Note: no lecture this Thursday (Feb 9)!

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The Momentum Principle for components d p dt = F net d p dt = d p dt ˆ p + p d ˆ p dt F net = F || + F Parallel component: Perpendicular component: A Direction of motion in point A d p dt d p dt ˆ p = F || p d ˆ p dt = F p d ˆ p dt = F d p dt || = dp dt = F || d p dt = p v R = F 2
Circlular motion: conditions R m For planets (assume sun is fixed) dp dt m s Only perpendicular component for circle! s

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## This note was uploaded on 02/06/2012 for the course PHYS 172 taught by Professor ? during the Spring '08 term at Purdue.

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Lect09 - PHYS 172: Modern Mechanics Spring 2012 EXAM 1...

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