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Unformatted text preview: 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 dp dt = & & 1 2 F F mg + + = & & & & Geometrical: mg & 2 F & 1 F & 2 tan F mg = & 2 tan ,0,0 F mg = & x y See p. 182 for details Additional examples: pp. 183-186 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) C) is down and maximized dp dt dp dt dp dt = & & & grav F & spring F & p = & Highest point Equilibrium Lowest point p =...
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- Spring '09