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Classical Physics

Physics 140, Fall 2009

Professor Sullivan

Email: sullivan@kenyon.edu
Office: Hayes 206
Phone: x5830
Office Hours: MW 11:10AM - 12N, 1:10-2:30PM
 

Current as of December 14, 2009
 
 
This course is the first semester of what is really a three-semester, calculus-based, introduction to physics. The other courses in the sequence are PHYS 145 (Modern Physics) and PHY S240 (Fields and Spacetime). In PHYS 140 (Classical Physics) we qwill start with the core physics issues of describing motion mathematically (called "kinematics") and determining how forces affect motion (called "dynamics") in the context of classical mechanics. Electric and magnetic fields will be introduced as the source of two of the forces we will be dealing with. We will examine the concept of a conservation law, a unifying theme in physics. Building on these basics, we will examine rotational, oscillatory, and wave motion, the orbits of planets and electrons, and electric circuits. All of this is designed to prepare you for the surprises of relativity and quantum mechanics to be presented in PHYS 145.

 
PHYS 140 has two co-requisite courses. The first is PHYS 110 (First Year Seminar in Physics). PHYS 110 is designed to give you a peek at what an undergraduate physics education prepares you for: exploring a current research topic in physics. (If you are not a first year student, then you must enroll in PHYS 141 instead of PHYS 110.) The second co-requisite is MATH 111 (Calculus A). Newton invented the calculus to describe motion and we will use calculus to do the same and more. However, PHYS 140 is structured so that you do not already have to know calculus in order to begin. But you must be taking MATH 111 at the same time as PHYS 140 (or maybe you have already taken MATH 111 or you have placed out of MATH 111.)

  The textbook for the course is University Physics, 12th edition by Young and Freedman. I feel your pain and bewilderment about the price. On the bright side, if you go on in physics this text will be useful for a lifetime and, if you do not go on in physics, the bookstore has a buy-back program at the end of the semester.

  Lectures are given three times each week. Attendance at lecture is not a factor in grading, but good attendance is highly recommended and you are responsible for all meterial presented in class. My notes are not suitable for copying, so seek out another students if you need notes from a class you may have missed.

  The course grades are based on homework (15%), two, two-hour midterms (each counting 25%), and a two-hour exam that is really just another midterm (but worth 35%) that happens to be given at the time specified by the Registrar for the final exam in this class (Friday, December 18, 2009 at 1:30PM). The mid-course, midterm exams will be held Tuesday, October 6th, 2009 and Tuesday, November 1st, 2009, both from 7:00-9:00PM. To determine if there are sufficient conflicts to force a rescheduling, I expect you to check these times for conflicts with your schedule and email me by next Monday (Spetember 7, 2009) if a conflict exists.

  There will be weekly homework problems due each Friday at the beginning of class. To help you work through Challenging problems, there will be a "help session" led by an upperclass physics major on the preceeeding Thursday evening and I have extended office hours on Wednesday afternoon. Do not be fooled by the small weight given the homework in the final grade. In physics, homework is to tests like practice is to games in sports. You don't get much credit for practices, but you can't expect to do well in games if you haven't practiced. Homework is also a chance to get feedback on the learning process. Close the feedback loop by going over returned homework and getting help on weaknesses that have been identified.

Late homework will be accepted up to one week after they are due, but with a penalty to encourage you not to get behind. If your homework is turned in between the start of class on the day it is due and the time that I transfer the papers to the grader, the penalty will be 10%.  If handed in after that time, but before the beginning of class one week later, the penalty will be 20% and will be graded when convenient for the grader.

  I absolutely encourage you to work with others while doing homework and studying for tests. There is no curve in this class, so it never hurts you to help others, and teaching others will deepen your own understanding. However, it is critical to the learning process that what you turn in represents your own understanding and should never be just a copy of others work. To test your understanding, try putting away all notes from a joint problem solving session and do the problems over by yourself, remiinding yourself of the reasoning behind each step. Simply turning in the results of other people's work is unhelpful (doesn't help your grade that much and you do not identify problem areas before an exam where it will effect your grade) and also constitutes plagiarism.

  I want to do everything that I can so that everyone is able to fully participate in class and has a successful experience in physics. Please contact me immediately if there is anything preventing your free and open participation in class. Additionally, if you have a learning disability and need accommodation, I encourage you to contact me, but more importantly, to contact Erin Salva (Coordinator of Disability Services, x5453, salvae@kenyon.edu) in the Dean of Academic Advising Office to determine appropriate and effective accomodation well before any such accomodation is needed.

  I also believe that each of you own a piece of me for the price of your tuition and I enjoy getting to know all of you a little better. Please do not hesitate to take advantage of my office hours (MW immediately after class, MW 2:10-3:00PM and W3:10-5:00PM). If you have a conflict during all of my office hours please contact me to arrange an appointment. Or just drop by my office in Hayes 206. I spend a lot of time in the department and if my door is open, I will be happy to talk to you.

  My swine flu policy: If you have symptoms of flu, DO NOT come to class. Follow the guidelines on self-isolation that the College has given you. However, please contact me by email (sullivan@kenyon.edu) or phone (X5830) - NOT in person - to discuss how you will meet class requirements while being stuck in your room.


 Course Calendar
 Date:  Topic:  Reading
  Homework due on this date
8/31  Welcome, What is Physics? (pretty pictures Power Point)
 none
 
 9/2  Units, Dimensions, and Uncertainties
 1.1 - 1.6
 
 9/4  Kinematics (linear and rotational)
 2.1-2.3, 9.1
 HWK #1 - 1.3, 1.5, 1.13, 1.14,  1.61
9/7  Kinematic quantities and their relationships
 2.4, 2.5, 2.6
 
9/9  Motion at constant (linear and angular) acceleration,  Vectors  9.2, 1.7-1.8
 
9/11
 Vector addition, subtraction, and scalar multiplication
 1.7-1.9, part of 1.10
 HWK #2 - 2.6, 2.9, 2.10, 2.18, 2.22, 2.38, 2.43, 2.46, 9.3, 9.6, 9.16, 9.19
9/14
 Unit vectors, Kinematics in 2D and 3D
 3.1, 3.2
 
9/16
 Vector kinematics (cont.)
 3.3

9/18
 Projectile motion, circular motion revisited
 3.3, 3.4  HWK #3 - 2.69, 2.74, 2.76, 2.77, 2.80, 2.85, 2.87, 1.32, 1.39, 1.43, 1.47, 1.51
9/21
 Newton's First Law  4.1, 4.2

9/23
 Newton's Second Law  4.3, 4.4

9/25
 Newton's Third Law, Applications of Newton's Laws
 4.5, 4.6, 5.1, 5.2
 HWK #4 - Q3.1, 3.2, 3.7, 3.9, 3.12, 3.21, 3.29, 3.33, 3.34, 3.44, 3.68, 9.22, 9.25, 9.28
9/28
 Applying Newton's Laws II: Friction, Springs  5.2, 5.3, 6.3
9/30
 Applying Newtons Laws III:  Dynamics of Circular Motion, Coulomb's Law  5.4,  21.1, 21.3
10/2
 Electric Force, Gravitational Force  21.1, 21.3, 12.1  HWK #5 - Q4.2, Q4.34, 4.9, 4.16, 4.32, 4.43, 4.45, 5.13, 5.14, 5.19, 5.22, 5.28, 5.30, 6.29 a) only
10/5
  Electric Field, Gravitational Field
 21.4-21.6, 12.2

 10/6
  First midterm exam 7-9PM RBH 109

 First midterm exam solution
10/7
  No class!
 

10/9
  Work and Kinetic Energy
  6.1, 6.2
  HWK #6 - 5.50, 5.55, 5.57, 5.69, 5.86, 5.104, 5.127
10/12
  October Break!


10/14
  Work if force is not constant, Path independence of work, Conservative forces
  6.3

10/16
  Work and Potential Energy
  7.1, 7.2
 HWK #7 - Q21.16, 21.13, 21.16, 21.26, 21.34, 12.1, 12.10, 12.19
10/19
  Conservation of (mechanical) energy
 7.3, 7.4

10/21
  Electric potential
 23.1-23.3

10/23
 Gravitational potential, equipotentials, impulse-momentum theorem, conservation of momentum
 23.4, 8.1, 8.2
 HWK #8 - 12.17, 21.28, 21.49, 21.106, Q6.16, 6.1, 6.3, 6.29, 6.32, 6.38, 6.66, 6.69
10/26
 1D elastic collisions
 8.4

10/28
 1D totally inelastic collisions
 8.3

10/30
 Center of mass
 8.5
 HWK #9 - Register with Mastering Physics and complete assignment #1.
From your book do Q7.20, 7.9, 7.12, 7.25, 7.28, 7.46, 7.63, 7.67, 12.24, 23.5, 23.10, 23.16, 23.21

11/2
 Rotational kinetic energy, moment of inertia, calculation of I   9.4 - 9.6

11/3
 Second midterm exam 7-9PM RBH 109

 Second midterm exam solution
11/4
 No class!


11/6
 Torque and angular acceleration, combined rotational and angular motion  10.1, 10.2
 HWK #10 - Mastering Physics #10 (3 items) and from your book: 8.10, 8.19, 8.39, 8.46
11/9
 Rigid body rotation about a moving axis
 10.3

11/11
 Vector rotational motion, angular momentum, conservation of angular momentum
 10.5-10.7

11/13
 No class - professor sick

 HWK#11 - Mastering Physics #11 (6 items) and from your book: 8.78, 8.90, 8.102, 8.113, 9.45, 9.79, 10.3, 10.11
11/16
 Electric current, Kirchoff's First Law
 25.1

11/18
 Resistance and resistivity, Kirchoff's Second Law
 25.2, 25.3

11/20
 Power and energy in electric circuits, series and parallel combinations of resistors
 25.4, 25.5, 26.1, 26.2
HWK #12 - Mastering Physics #12 (8 items) and from your book: 10.20, 10.40, 10.48, 10.71, 10.103 (but fix typo in part b)
11/23-27
 Thanksgiving Break!


11/30
 Magnetic force on a charged particle and a current carrying wire
 27.1-27.4

12/2
 Magnetic force on a current loop
 27.5-27.7

12/4
 Magnetic field generation
 28.1-28.4
 HWK #13 - Mastering Physics #13 (7 items) and from your textbook: 25.5, 25.18, 25.58, 25.43, 25.81, 25.86
12/7
 Forces between current carrying wires, describing periodic motion
 28.5, 13.1

12/9
 Oscillations in time, simple harmonic oscillator
 13.2, 13.4

12/11
 Energy in a simple harmonic oscillator, simple pendulum, traveling waves
 13.3, 13.5, 15.1, 15.2
 HWK #14 - Mastering Physics #14 (14 items)
12/14
 Traveling waves and standing waves
 15.3, 15.6

12/18
 Final Midterm 1:30 - 3:30PM RBH 109