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Uiuc Tam 211 Homework Answers

Welcome! This is the official course website for TAM 251 at UIUC in Spring 2018.

As well as the pages on this website, this course uses:


TAM 251 Course Organization:

Due dates and testing periods for assessments and evaluations can be found on the schedule page.






1: Stress

  • Equilibrium and Stress
  • Normal and Shear Stresses
  • Allowable Stress Design

Homework 1

Quiz 1/1R

2: Strain, Material Properties, and Axial Loading

  • Strain
  • Stress-Strain Diagram
  • Deformations under Axial Loading
  • Statically Indeterminate Structures
  • Temperature Effects
  • Misfit Problems

Homework 2

Homework 3

Homework 4

Quiz 2/2R

3: Torsion

  • Torsion
  • Torque-Displacement Relation
  • Indeterminate Shafts

Homework 5

Quiz 3/3R

In-Class Quiz 1 (Units 1-3)

4: Beams in Bending

  • SF and BM Diagrams
  • Beams in Bending - Normal Stress
  • Composite Beams

Homework 6

Quiz 4/4R

5: Transverse Shear Stress

  • Transverse Shear
  • Shear Flow

Homework 7

Quiz 5/5R

6: Stress Transformation

  • Combined Loading
  • Pressure Vessels
  • Stress Transformation
  • Generalized Hooke's Law
  • Theories of Failure

Homework 8

Homework 9

Quiz 6/6R

In-Class Quiz 2 (Units 1-6)

7: Deflection

  • Deflection in Beams - Integration Methods
  • Deflection in Beams - Superposition Methods

Homework 10

Homework 11

Quiz 7/7R

8: Statically Indeterminate and Buckling

  • Statically Indeterminate - Integration Methods
  • Statically Indeterminate - Superposition Methods
  • Buckling


Final Exam (Cumulative)


Prof. West: MWF, 2-3pm, MSEB 100

Prof. Matlack: MWF, 3-4pm, MSEB 100

Website: The official class website is

Description:Kinematics and dynamics of the three-dimensional motion of particles; kinematics and dynamics of the plane motion of rigid bodies; methods of work/energy and impulse/momentum; moving reference frames.

Prerequisites: TAM 210 or TAM 211.

Reference texts:Dynamics reference pages

Alternative texts:

  • R. C. Hibbeler, Engineering Mechanics: Dynamics, 13th edition, Prentice Hall, 2012, ISBN 0132911272, (Amazon).
  • G. Gray, F. Costanzo, and M. Plesha, Engineering Mechanics: Dynamics, 1st edition, McGraw-Hill, 2009, ISBN 0077275543 (Amazon).
  • D. J. McGill and W. W. King, Engineering Mechanics: Dynamics, 4th edition, Tichenor Publishing, 2003, ISBN 0742134938, (Amazon).

Matlab References:

Grading: The total score for the course is computed with the following weights:

Online quizzes40%Project reports8%
Final Exam30%Online homework10%
In-lecture iClickers4%Discussion worksheets8%

Final grades: The total score s corresponds to final grades as follows. 

97.0% ≤ s < 100.0%A+93.0% ≤ s < 97.0%A90.0% ≤ s < 93.0%A-
87.0% ≤ s < 90.0%B+83.0% ≤ s < 87.0%B80.0% ≤ s < 83.0%B-
77.0% ≤ s < 80.0%C+73.0% ≤ s < 77.0%C70.0% ≤ s < 73.0%C-
67.0% ≤ s < 70.0%D+63.0% ≤ s < 67.0%D60.0% ≤ s < 63.0%D-
s < 60.0%F    

This means that a score of 79.998% is a C+, while 80.000% is a B-.

iClickers: Short quizzes are conducted during lectures using iClickers (70% participation, 30% correctness). An iClicker remote can be purchased from any of the bookstores, and must be registered on Compass, under the tab "Register i>clicker". You need to register your iClicker by the end of Week 2, when the iClicker roster will be synced for the last time. The first iClicker use for credit will take place in Lecture 2 of the semester. There will be 3 dropped iClicker grades.

Quizzes:These quizzes are designed to assess your problem solving skills on course material. Solutions will not be posted. All quizzes will be held in the CBTF (Computer-based Testing Facility) and follow the rules of the CBTF. Each quiz grade is determined from the following formula: max([First Try, 1/3*(First Try) + 2/3*(Quiz Retry)]).

Discussion sections: Discussion sections start in Week 1 of semester, with the schedule below. All discussion sections meet in MEB 252. Many of the doors to MEB are locked after 5:30pm, but the south entrance to MEB (i.e., facing Green St.) remains unlocked until 9:30pm.



Jiashuo, Amelia




Jiashuo, Yufei




Jiashuo, Abishek 



Chris, Amelia



Chris, Yufei



Amelia, Zachary


Timothy, Andrew


Abishek, Yufei



Timothy, Yunjo


Jiheng, Abishek



Jiheng, Nada


Chris, Jiheng 



Nada, Zachary



Nada, Andrew



Yunjo, Andrew


You are encouraged to bring a tablet or laptop to discussion section to access the online reference pages.

Online homeworks: Weekly online homeworks will use PrairieLearn.

Project Reports: Please see the Project Description

Final Exam: Online in the CBTF, during Finals Week .

Office hours: Daily office hours are held in MEB 252 according to the schedule below. Office hours start in Week 2 of the semester.

Monday, 6pm-8pmTuesday, 6pm-8pmWednesday, 6pm-8pmThursday, 6pm-8pmFriday, 6pm-8pm

Xian & Arman

Amelia & Abhishek

Michael & Ganesh

Nada & Yufei

Joao & Sara

Jiashuo & Zach

Sara & Ganesh

Andrew & Tim

Arman & Ray


Online forum (Piazza): This class uses Piazza for ALL communications between the instructor, TAs, CAs, and students. Students should not communicate with instructors via email. This is so we can ensure a faster response and keep everyone informed about what's going on.

Students are encouraged to post public messages on Piazza ("Post to Entire Class"). If you like, you can post anonymously, but we encourage everyone to use their name because it makes a friendlier and more welcoming environment. We will never judge anyone for asking anything on Piazza, and you will see professors, TAs, and CAs making mistakes and saying stupid things as well!

You can also use the private feature on Piazza by posting a message visible only to the Instructors. In this last case, you should type "Instructors", instead of sending a message to a specific TA or instructor. Again, this helps to ensure that you get a prompt response.

TAs and CAs are scheduled to be checking Piazza on the following days:





Zach & Amelia


Andrew & Yunjo




Tim & Nada