Policy, assignments, and
TAM 203, Fall 2008
Homework policy: To get credit, please do the things listed below on every homework.
a) Homeworks will be collected soon after class starts. Homework handed in later will be marked "late." For example, you should have the first homework assignment in hand at your seat at the start of lecture on Tuesday Sept 2.
b) On the top right corner neatly print the following, making appropriate substitutions as appropriate:
HW probs 1-7, Due September 2, 2008
Section 1 at 12:20
TA: Rong Long
b) STAPLE your homework at the top left corner.
c) At the top of all work clearly acknowledge all help you got from TAs, faculty, students, or ANY other source (but for lecture, text and section). Examples could be "Mary Jones pointed out to me that I needed to draw the second FBD in problem 2." or "Nadia Chow showed me how to do problem 3 from start to finish." or "I basically copied this solution from the solution of Jane Lewenstein " etc. If your TA thinks you are taking too much from other sources he/she will tell you. In the mean time don't violate academic integrity rules: be clear about which parts of your presentation you did not do on your own. Violations of this policy are violations of the Cornell Code of Academic Integrity.
d) Every use of force, moment, momentum, or angular momentum balance must be associated with a clear correct free body diagram.
e) Your vector notation must be clear and correct.
f) Every line of every calculation should be dimensionally correct (carry your units, see text Appendix A).
g) Your work should be laid out neatly enough to read by someone who does not know how to do the problem. Part of your job as an engineer will be to convincingly get the right answers. That is your job on the homework as well.
h) Some problems may seem like make-work because you already know how to do them. If so, you can get full credit by writing in full "I can do this problem but don't feel I will gain from writing out the solution". You can keep doing this unless/untill your grader/TA challenges your self-assessment.
i) Computer work should be well commented. At the top the computer text file should include your name which you later highlight or circle with colored pen. At least some part of any computer output should also include your name, printed by the computer. Also highlight this or circle it with colored pen.
j) At least one problem in each assigment should be "solutions quality". This should start on a fresh page, use single sides, and not have a new problem start on the same page. It should be self-contained, including, for example, enough of a problem restatment so that a reader need not see the original problem statement. It should be clear and convincing enough so that another TAM 203 student who has not done the problem and does not know how to do it, can read your solution, understand it, and judge that it is correct. The first word of this solution should be "SOLUTION".
Study advice: Try to do assigned homework problems from beginning to end with no help from book, notes, solutions, people, etc., yourself without looking up even one small thing. Explain, at least outloud to yourself, every step. If you did need help, then afterwards start the problem over by yourself without looking up even one small thing. Then similarly do other problems that are like the assigned problems. Then do old prelims and exams. Finally, for A+ style studying, invent and solve your own problems.
Homework Re-grading policy
Homework assignment below subject
to change until 3 AM of the morning after which they are listed below
(e.g., August 28 assignment due September 2 is not set in stone until August 29 at 3 AM)
Problems are from RP (Ruina and Pratap) unless otherwise specified or written out.
Aug 28 Th Section 9.1: Force and motion in 1D
HW for Aug 28 (due Sep 2 at start of lecture).
1) Read the Policies above and on the linked pages above. Write "I have read and understood the HW and academic integrity policies for this course. The questions I have about them are: ____." Sign your name.
2) Look over text Table of Contents and the front and back tables.
Read Preface and Chapter 1 (pages 10 - 34) and Section 9.1 (396-417).
Write: "I have done _____% of the assigned reading."
3) Write "I can do all the preparatory problems for 9.1 except for ________."
Sep 02 Tu 9.1 cont'd: Numerical Solution of ODEs
HW for Sep 2, due Thurs Sept 4
1) 9.26 (numerical solution, analytical solution is optional extra)
Sep 04 Th 9.2, Energy methods in 1D
HW due Tues Sept 9
0) Don't hand in: Redo 9.26 without looking up anything.
1) 9.30 This is easy, just vocabulary practice.
2) 9.37 The fall distance is the wall height + the leg bending. A simple problem.
3) 9.38 A simple energy problem using some wierd archery words (remember to turn page).
4) 9.43 This is a bit subtle and takes a bit of thought.
Sep 09 Tu 9.3 & 9.6: Vibrations: mass, spring
and dashpot; Forcing and resonance
HW due Thurs Sep 11
1) 9.49 A basic very simple spring-mass problem.
Sep 11 Th 9.4: Coupled motions in 1D
HW due Tues Sep 16
1) 9.53, because of gravity the concept of "rest position" for a hanging mass has two possible meanings. This problem takes you slowly through the issues associated with defining displacement various ways. The last part takes some thought (of course you should give a justified answer, not a guess).
2) 9.55 Part c requires careful thought because the period of time of contact with the trampoline is not half the period of the associated harmonic oscillator (because of gravity, the feet don't leave the trampoline at the mid-point of the oscillations).
3) 9.109 This practical engineering problem rests on the copy of "frequency response" which was only quickly explained in lecture, so you may need to rely on the text and samples.
4) 9.73 This is a very simple conceptual question, basically asking the difinition of normal mode.
5) 9.76 A slight extension of the lecture example (with a dashpot and forcing)
6) 9.82 A simple problem intended to make you think about motions of multi-DOF systems.
Sep 16 Tu 9.5: Collisions in 1D
HW due Thurs Sep 18
1) 9.84 A simple problem taking you through the concepts and vocabulary of 1D collisions
Sep 18 Th 10.1-3: A particle in space, momentum & energy,
HW due Tues Sep 23
1) 9.92 Tests if you can keep your hat on while calculating a sequence of collisions. And the answer is interesting.
Solutions to most homework through 9.92.
2) 10.22 In spirit this is extremely close to a 3D particle statics problem.
3) 10.26 This problem is genuinely interesting. It has all the look of an intractable non-linear problem but turns out to be a simple linear problem.
4) 10.30 This problem should expand your understanding of parabolic-flight ballistics to the more realistic ballistics of things where air drag is important.
Sep 23 Tu 11.1-2: Coupled particle motion, particle collisions
HW due Thurs Sep 25
1) 10.55, a very simple problem to show if you know what the words mean.
Sep 25 Th 12.1: 1D constrained motion & pulleys
HW due Tues Sep 30 (may be handed in late with no penalty on Oct 2)
1) 10.61 A computer simulation of a missile trajectory
2) 11.10 A cute simulation of 3 balls in space.
3) 11.20 Very much like lecture example
4) 11.17 Note that 11.17 is not of the standard form, so you can use your program to check your answer, not to generate it
5) 12.6 Just like lecture, easy
6) 12.14b Slightly more involved pulley problem
7) 12.26 Pulley with spring, a bit more involved
Sep 30 Tu 12.2: 1D motion with 2D & 3D forces
Prelim 1, Thr 205 (Covers HW through that handed in onThurs Sept 25. Covers lectures through Sept 23. Covers text chapters 1,2,3,4, 9,10, 11.1)
HW due Thurs Oct 2
1) 12.40 Simple constrained object problem
Oct 02 Th 12.2 cont'd
HW due Tues Oct 7
1) 12.43 Il-posed constrained-object problem, why?
2) 12.54 Car braking. Long statement, but basically just a sequene of hints for a problem that could be stated briefly.
Worth doing carefully and well.
3) 12.72 3D supported plate, good place to practice 3D vectors. Not hard once you know how.
4) 12.76 3D braked car. You have to know your 3D vectors for such problems.
Oct 07 Tu 13.1: Circular motion kinematics
HW due Thurs Oct 9
1) 13.1 Basically a vocabulary lesson/test
2) 13.15 A simple test of whether you can work with the ideas
Oct 09 Th 13.2: Dynamics of a particle in circular motion
HW due Thurs Oct 16
1) 13.36 Everything (or most things) you should know about a simple pendulum
At this point you can also do the next two problems (below)
Oct 16 Th 13.3: 2D rigid-object rotation
HW due Tues Oct 21
1) 13.45 another circular motion problem, bead on a hoop with friction
2) 13.49 a classic energy/circular motion problem,
3) 13.58 computer graphics, using rotations to draw a rotated drawing.
(Note drawing error: the 30 degree angle to the x and y axes should be called phi)
Oct 21 Tu 13.4: 2D rigid-object angular velocity
HW due Thurs Oct 23
1) 13.73 a simple problem. But you have to think to turn the words into sensible equations.
Oct 23 Th 13.5-6: Polar moment of inertia and dynamics of a planar object in circular motion
HW due Tues Oct 28.
2) 13.81 very simple gear problem, like lecture example from 10/21
3) 13.83 a more challenging problem, with a math and computer flavor, about angular velocity. Could take an hour or so.
HW due Thurs Oct 30 (not 28).
4) 13.112 quick easy mechanics problem
5) 13.122 easy mechanics problem (almost just kinematics)
HW due Tues Nov 4 (more below)
6) 13.136 multipart pendulum problem. For parts (a,b) answer in terms of sensible variables (delete the word 'as'). A computer will help with some of the plots. This problem will take at least a good hour to do well.
Oct 28 Tu 14.1: Rigid-object kinematics
Prelim 2, Thr 205( covers through HW handed in on Oct 28)
HW due Thurs Oct 30
Oct 30 Th 14.2: Mechanics of a rigid object
HW due Tues Nov 4 (see also problem 13.136 above)
Nov 04 Tu 14.3-4: Kinematics of rolling
and sliding; contact
HW due Thurs Nov 6
Nov 06 Th 14.5: Collisions
HW due Tues Nov 11
Nov 11 Tu 15.1: Polar coordinates & path coordinates
HW due Thurs Nov 13
Nov 13 Th 15.2-3: Rotating frames & their base
vectors; velocity and acceleration
HW due Tues Nov 18
Nov 18 Tu 15.4: Kinematics of 2D mechanisms
HW due Thurs Nov 20. Solutions through 15.29
Nov 20 Th 16.1: Mechanics of a constrained particle
HW due Tues Nov 25
3) 16.1 : Typos in prob 16.1. You should neglect gravity. Besides the angels there
are no other forces on the hoop. At t=0 the bead is on the +x axis.
Nov 25 Tu 16.2-3: 1 DOF 2D mechanisms; multi DOF mechanisms
Prelim 3, Thr 205 (Covers through solutions that are posted Sat before the prelim.)
HW due Tues Dec 2
Thanksgiving recess (recitations meet Wed until 1:10 PM)
Dec 02 Tu 16.3: Multi DOF 2D mechanisms
HW due Thur Dec 4
Dec 04 Th 16.3 cont'd
Do but don't hand in:
Sat Dec 6: Makeup prelim and Homework exam
Wednesday Dec 17: Final Exam