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Lect08short-Phys172s11-(5.2-5.7,4.11-curving_motion,spring-mass)

Lect08short-Phys172s11-(5.2-5.7,4.11-curving_motion,spring-mass)

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Spring 2011 PHYS 172: Modern Mechanics Lecture 8 – Exam review, Curving motion, spring-mass Read 5.2-5.7, 4.11 EXAM 1 is next week Time: 8:00-10:00 pm Wed Feb 9 Place: Elliott Hall Material: lectures 1-8, HW 1-8 (chapters 1-5 in the book, except 4.11-4.14) Problems: multiple choice, 14 questions (70 points) write-up part, hand graded (30 points) Equation sheet: provided with exam Practice exam + equation sheet: will be posted at the end of this week Note: no lecture on Feb 10 ! Equilibrium with two strings net dp F dt = ° ° m Static equilibrium mg ° 2 F ° 1 F ° Know mass. Need to know the force F 2 required to achieve θ 0 dp dt = ° ° 1 2 0 F F mg + + = ° ° ° ° Geometrical: mg ° θ 2 F ° 1 F ° 2 tan F mg θ = ° 2 tan ,0,0 F mg θ = ° x y See p. 182 for details Additional examples: pp. 183-186

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Clicker: Rate of change of momentum p ° p ° net dp F dt = ° ° 4 . What is at the highest point? dp dt ° 2 . What is at the equilibrium point? dp dt ° 3 . What is at the lowest point? dp dt ° A) is up and maximized B) 0 C) is down and maximized dp dt dp dt dp dt = ° ° ° grav F ° spring F ° 0 p = ° Highest point Equilibrium Lowest point 0 p = ° grav F °
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Lect08short-Phys172s11-(5.2-5.7,4.11-curving_motion,spring-mass)

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