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Lect08-Phys172s10-(4.11,5.1-5.7.Curving_motion,Oscillator)

Lect08-Phys172s10-(4.11,5.1-5.7.Curving_motion,Oscillator)...

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Spring 2010 PHYS 172: Modern Mechanics Lecture 8 – curving motion , oscillator Read 4.11, 5.1-5.7 1. Clicker questions: scores transferred to CHIP If your lecture attendance/quiz scores in CHIP are blank: check if you entered iClicker ID correctly into CHIP 2. EXAM 1 is next week!!! Time: 8:00-10:00 pm Wed Feb 10th Place: Elliott Hall Material: lectures 1-8, HW 1-8 (chapters 1-5 in the book) 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 11! 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 ° spring F ° Perpendicular component (to trajectory) Parallel component (Along trajectory)
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