November
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| Ø 9th | |||||
| Ø 16th | |||||
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Ø 23rd |
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Ø 30th |
An outline of topics to be addressed each day is presented below. This list is not complete; additional items are covered for most classes. If students are absent, they should consult these pages and check with the instructor concerning material missed.
¢ Schedule: check periodically, I do not provide daily, by page, etc, reading assignments - check the schedule and stay up with reading IAW
the schedule and my presentations
¢ Review Exercise graded and returned.
ð Must know concepts before it makes any sense trying to work problems - otherwise what tools would you use?
ð Some do not know when the principles and laws can be used - this is a very important problem solving tool
ð Some are clearly not looking at past exercises since many are repeated each time
ð Lenient grading on a problem does not mean lenient grading if the problem is repeated on another exercise
ð 1 got all 5 extra credit correct and 1 got 4 of the 5 correct
ð Each problem counted 1 point, each extra credit counted 1/2 point
ð Grades ranged from 68 to 97
¢ Examples from chapter 7 - discuss solutions
¢ Velocity of the bullet example
¢ Exercise 2-3 and the optional Exercise (2-3a) due Wednesday
¢ Lab 2-3
¢ Rotational motion - problems discussed and solved tomorrow - a lab day
Tuesday (Double Period)
¢ Discuss another version of this lab - determining velocity of a bullet
¢ Lab 2-3
¢ Concepts demonstration: two rods of equal weight, one easier to rotate. Why?
¢ Kinematic and angular equations - counterparts
¢ Chapter 8 - Rotational Motion: Examples
¢ Response I received from the Academy concerning requirements associated with trips to Starbucks, etc.
¢ The exercise given yesterday: Number 4
¢ Concept demonstrations will be given throughout the course - questions concerning these will be on review exercises
For review, they will be consolidated on a page of my manual
ð Review: Rotating Rods - What concept was demonstrated by Spencer yesterday?
ð Review: The loop - what was being demonstrated?
ð Review: Colliding balls - was was being demonstrated?
ð Rotating object on a string. What is being demonstrated?
ð Force applied to a wheel. What is being demonstrated?
ð Rotating chair - what is being demonstrated?
¢ Schedule for the remainder of the month
¢ Chapter 8 - Rotational Motion: Notes
¢ Exercise 2-4 Part a. Part b will be posted before next class.
¢ No Class
¢ Suggestion for remembering and understanding concepts in rotational motion
¢ Exercises and labs graded - will be returned at end of class
11 problems including sub parts
Each counted 4 points
Grades ranged from 68 to 100
4 students had a grade of 100
ð Exercise 2-3a optional problem
4 students submitted solutions
2 students did not do all of the problems - no grade assigned
2 students received 1000
ð Lab 2-2
¢ Lab 2-3 due today. 2 teams have already submitted - check status of assignments periodically (frequently)
¢ Exercise 2-3: Missing 1 student - will post solution and grade papers after I receive the paper today
¢ Video demonstrations
ð Apollo 15: Hammer and Feather demonstration: http://video.google.com/videoplay?docid=6926891572259784994#
ð Conservation of angular momentum demonstration: http://www.youtube.com/watch?v=yAWLLo5cyfE
¢ Moments of Inertia Table: To be provided for all Review Exercises
¢ Concept Demonstrations: Each demonstrated by several students
ð Rotating wheel: what happens when try to change the orientation of the axis of rotation and why?
ð Rotating Rods: Rotation axis through the center versus rotation axis at one of the ends: What changes and why?
ð Wheel and chair that can rotate. Wheel initially spinning clockwise with angular momentum vector up. Chair initially stationary.
What happens when the direction of the angular momentum vector is reversed and why?
¢ Finish Chapter 8 - Rotational Motion: Example Problems
¢ Start Chapter 9: Static Equilibrium; Elasticity and Fracture next class
¢ Exercise 2-4 Part a. Part b
¢ No Class
¢ Repeat of note from last class - some teams missing the last lab. Teams 4 and 6 have not submitted (it was due 11-9, 4 points per day)
¢ Pick up graded assignments at end of class
¢ Additions to the Concepts Demonstrations page
¢ Review exercise Thursday of next week. Will cover all material through chapter 8.
¢ Chapter 9: Static Equilibrium; Elasticity and Fracture
¢ Check my notebook periodically for status of assignments - not there then did not submit using procedure mentioned many times (hand to me, etc)
¢ Exercise 2-4 Part a. Part b
¢ Repeat of note from last class - some teams missing the last lab. Teams 4 and 6 have not submitted (it was due 11-9, 4 points per day)
A member of one of these teams was not even working on it during last class when time was given. If one member of a lab team is absent that
does not impact the due date.
¢ New policies being implemented-enforced because some refuse to follow instructions, wisely use available time, not surf net, interfere with other
students that want to learn, etc.
ð Labs - end dates will be assigned - make sure you understand the stated policy on end dates
ð Exercises - end dates will be assigned - make sure you understand the stated policy on end dates
I do not grade assignments until all have been submitted. Those that continue to delay the submission are impacting others. It is ironic that a student that is consistently asking if assignments have been graded yet was one of the ones wasting time yesterday instead of completing and submitting the lab.
ð Unannounced quizzes - continue to not pay attention during presentations at your own risk
ð Use of stools instead of desks. Stools are not to be used unless you are given permission to use the computers. Sit at the desk and not on the desk
ð New policy on use of the computers - do not use unless given permission on an individual basis
ð All violations of any policies will be immediately reported without further warning
¢ Policy on cell phones in class
¢ Check my notebook periodically for status of assignments - if not there then you did not submit using procedure mentioned many times (hand to me, etc)
¢ Review exercise announced earlier for Thursday of next week will be on Wednesday, a double period. During the first part of the period I will cover - explain some
sample problems and the Review Exercise will be given the second half of the period. It will cover all material through chapter 8.
¢ Equations and other data provided for the AP exam: http://www.collegeboard.com/prod_downloads/ap/students/physics/physics_equation_tables.pdf
¢ Chapter 9: Static Equilibrium; Elasticity and Fracture
¢ I asked TIS to reinstal Adobe Reader yesterday.
¢ Read the notes from yesterday - no further warnings (use of pc's, cell phones, end dates, unannounced quizzes - to the group or individuals etc)
¢ A word to the wise.
If I curve grades I am under no obligation to apply the same formula to everyone or to even curve everyone. If I were then, logically, the whole rocess would be
ridiculous. If you do not give me the impression that you are trying or give me the impression that you are merely intent on interrupting the efforts of others, then
your grade does not deserve to be curved and will not be. In a sense, you can compare this to the practice of some teachers that give credit for class participation.
¢ I will be on a field trip with my Astronomy class Monday for a tour of the Very Large Array. Work on the assignment or review for the Review Exercise.
¢ Latest Learning Objectives from the AP Physics College Board - Word document I converted from postscript, reformatted, etc.
¢ Chapter 9: Static Equilibrium; Elasticity and Fracture: Note the restricted focus for this chapter: sections 9.1, 9.2, and 9.4 only
¢ Schedule: check periodically, I do not provide daily, by page, etc, reading assignments - check the schedule and stay up with reading IAW
the schedule and my presentations
¢ Start Chapter 10: Fluids Sections 10-1 through 10-10 only See Cast of Characters section in notes portion of the manual - will be in all applicable chapters -
material for extra credit questions
¢ Lab 2-3 graded and returned
ð Points lost for being late
ð Momentum is conserved in inelastic collisions - as long as no outside force is acting. Remember the problem I solved in class with the bullet impacting the
target. This was an inelastic collision. In the first part I used conservation of momentum - no outiside forces acting. In part 2 I could not use conservation of
momentum because an outside force was acting. The air table removed the friction component of the problem in this lab.
¢ Next class is a double period day
ð First part of period: I will cover some material in chapter 10: Fluids
ð Second part of period: Review exercise on material through chapter 8.
¢ Chapter 9: Static Equilibrium; Elasticity and Fracture:
ð Note the restricted focus for this chapter: sections 9.1, 9.2, and 9.4 only
ð Also not the specific problems in the text (that I have been told you are all reading) you should read in detail.
Wednesday (Double Period)
¢ Consolidated labs section of the manual
¢ Discuss sample problems in Chapter 10: Fluids
¢ Review Exercise on material through chapter 8
¢ One student needs to take the Review Exercise. I will then post solutions and grade the papers.
¢ The quotations page: Jim Mims
¢ The quotations page: Richard Feynman
¢ The difference between explaining something and knowing why something is as it is at a fundamental level
¢ A review of some concepts covered earlier in chapter 1
ð The King's crown
ð Demonstration
ð Pictures in manual - demonstrations page
¢ Collision of Billiard Balls in 2-D (earlier examples have been in 1-D)
¢ Bumper carts demonstration
¢ Discuss sample problems in Chapter 10: Fluids
¢ Lab 2-4 due date extended to last class. One student did not submit
¢ Consolidated labs section of the manual - plan is to assign most and discuss the rest
¢ Review the concepts demonstrated last class: Concept Demonstrations by Chapter section of the manual
¢ Unannounced exercise solution
¢ Review Exercise 2-2 Solution
¢ Physlets - next exercise will include
¢ Exercise 2-4 in 2 parts - part 2 will be assigned next class
¢ I plan to discuss the solution to most of the 23 questions for the chapter and a number of the problems next class
¢ Will have all exercises and the Review Exercise graded and returned next class
¢ Portion of video - Richard Feyman: Best Mind Since Einstein
¢ Solutions posted
¢ Unannounced exercise graded - returned.
ð 10 questions, last one not graded. First 9 graded
ð Misses ranged from -3 to -8
ð Counted 3 points each
ð Scored strictly, graded leniently (only 3 points per problem - 73 if miss all of them
ð Grades ranged from 76 (1 student) to 91 (4 students)
ð Grades are counted
¢ Exercise 2-3 graded and returned
ð If there are multiple parts (a, b, etc) then clearly label each part
ð For impact zone problem, had to clearly state that delta t was increased
ð 9 problems - 3 points each.
ð Grades ranged from 97 to 100
¢ Physlets
ð Please do no copy from the lab machines
ð Program has been installed on the other 2 computers: CS51110 and CS51103 - let me know if anyone still has a problem accessing
ð Will always provide sufficient time (assuming your time is used wisely) in class to work problems of this type
¢ Chapter 10: Fluids: Examples
¢ Exercise 2-5 in 2 parts: note that this is an exercise and not a lab - required lab format does not apply
¢ No Class
¢ Thanksgiving
¢ Thanksgiving
¢ Thanksgiving
¢ New gradebook procedures
¢ Some commentary from the College Board
¢ Computer swap: CS5001 exchanged for the older PC next to printer - Physlets are on C drive in the CompSci directory
¢ Exercises graded; will be returned at end of class Check the solutions if you have not done so already
ð Exercise 2-4: The importance of inertia and moment of inertia - do not get sidetracked in your responses with peripheral concepts or observations
Ø Difference between no forces and no net forces acting...for conservation of linear momentum
Ø Some described the situation instead of answering the questions - WHEN - what situation - no net external forces, only conservative forces, etc.
Ø Rotating rods rationale - had to mention moment of inertia - the key concept - resistance to rotational motion. If used torque as explanation, then where
was it applied when rotating about the center? About the end? What was difference? (answer - moment of inertia) Moment of inertia was mentioned and
explained throughout this demonstration - on site also...
See next problem
Ø Rotating mass on a string
No net torque (force acting at center) and only served to shorten length of string) therefore angular momentum is conserved.
Must mention the purpose of the demonstration - conservation of angular momentum.
4 students mentioned this and got it right
Ø Animals running. Must mention moment of inertia - the main point of the question
Ø Problem 22 had 2 parts, a and b. Clearly label parts for problems with multiple parts - second warning - points deducted next time
Ø 16 problems: 5 points each
Ø Grades ranged from 70 (1 student) to 100 (2 students)
Ø Accelerated disk: question concerned the angular velocity at the end of 30 s
Ø Were to assume that the answer was m rad/sec - then use that in your response - read the problem
Ø Two disk shaped wheels problem not graded - look at how angles are given - need component of force perpendicular to radius in calculating torque
Ø Total kinetic energy of the rolling sphere is the sum of its rotational and translational kinetic energies. Got credit for indicating that, regardless of number
Ø Conservation laws and principles: The following 2 statements are not saying the same thing
B. In a system on which no outside non-zero forces are acting
K.
When the external forces acting on the system add to zero
¢ Link to Equations for Use on AP Exam on Manual Home Page (copy is on my site for faster downloading)
¢ Relevant equations for each chapter
¢ Summary of relevant contributions by the pioneers in each chapter
¢ Two cups and pressurized air demonstration - virtual demo
¢ Solved questions and problems for chapter 10
¢ Schedule Manual (follows AP topic organization)
¢ Review Exercise on material through chapter 10 Tuesday of next week
¢ Start chapter 13 next class: Temperature and Kinetic Energy
¢ Next Month
¢ Next Month
¢ Next Month
¢ Next Month