PHY 181, Fall, 2006

Week 11

 

  Main Objectives
bulletBe able to calculate angular momentum of an object
bulletKnow under what conditions angular momentum is conserved
bulletBe able to calculate changes in angular momentum due to applied torques
bulletBe able to apply conservation of angular momentum both to the solution of numerical problems and to the explanation of physical phenomena
bulletKnow the conditions that must be met in order for motion to be called simple harmonic motion
bulletBe able to apply conservation of energy to simple harmonic motion
bulletBe able to analyze all the information contained in x(t) for a simple harmonic oscillator
bulletGiven the mass, spring constant, initial position, and initial velocity for a simple harmonic oscillator, be able to write x(t), v(t), and a(t).
bulletUnderstand why a pendulum meets the conditions for SHM
bulletBe able to describe what is meant by the terms underdamped, overdamped, critically damped, and resonant motion; explain under what conditions each occurs; and give a practical example for each.
Tuesday Discussion of angular momentum.  Practice problems on rotational dynamics, center of mass, and moment of inertia.

Outside of class:    If you are having any trouble thinking about rotational motion, particularly directions,  Activ Physics 7.1 and 7.7 may help.  Activ Physics 7.9 will help with problem 74.  Do Ch.13 homework problems 43, 74, 78, and 80 for Thursday. Read Ch. 14 Sec. 1 and 4.  Do workbook exercises 1, 3, 5, and 6.  

Thursday Introduction to simple harmonic motion.

Outside of class:  Read Ch. 14 Sec. 3, 5, and 6.  Do workbook exercises 12, 18 and 21.   Complete Ch. 14 homework problems 3, 6, 10, 14, and 17 for tomorrow.
Friday Continue discussion of simple harmonic motion with emphasis on energy.  Discuss damped and forced harmonic motion.  View film of Tacoma Narrows Bridge Collapse.  (Some of this will probably carry over into next week.)

Outside of class:    Read Ch. 14 Sections 7 and 8.  Complete Ch. 14 homework problems 15, 23, 34, 36, 47 and 69 for Tuesday.  Begin your review for Thursday's exam.