PHYS 221 Supplemental Instruction

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Lecture: MWF 10:00-10:50 am
Instructor: JOHNSTON

SI Leader: Scott B.

Weekly SI Sessions

Monday 4:10pm @ Online
Tuesday 6:10pm @ Online
Wednesday 5:10pm @ Online

About SI for this Course

Supplemental Instruction is provided online via WebEx during the period of online classes. Join my SI sessions by using this link:

Due to potential unforeseen obstacles SI Leaders may encounter as they move to online delivery, some sessions may be modified, cancelled, or suspended.

Trying to learn physics can be a daunting task. Through SI, I will try to help you learn in bite-sized chunks throughout the semester so you can learn with less stress. In sessions, I will generally give you plenty of opportunities to work on problems you might see on an exam so you can be in that mindset early on. Since instruction has moved online, I will post an answer key following every session.

If you wish to contact me at any point, please use the "Contact Your SI Leader" link in the menu on my webpage.

Happy studies! I hope to see you throughout the semester.


Online Instruction

Hello all!
Like you all, I am trying to work my way through shifting to online instruction in classes as well as in SI. I have a few general changes in policy I would like you all to be aware of for my future sessions:
1. All sessions will be held through Webex through the end of the semester (Day and time will not be changed)
2. Worksheets will be posted the day before their respective session
3. Answer keys will be posted on completion of respective session
4. Please use the Webex chat to sign into session with University ID number or netid
As always, if you have any questions or concerns, feel free to contact me through my SI page.


Phys221_Wkst_Mar25 [PDF] - Orbit, Kepler's Laws

Phys221_Wkst_Mar24_key [DOCX] - Gravitation key

Phys221_Wkst_Mar24 [PDF] - Gravitation

Phys221_Wkst_Mar23 [PDF] - Fluid Statics

Phys221_Wkst_Mar23_key [DOCX] - Fluid Statics Key

Phys221_Wkst_Mar11 [PDF] - Power from Torque, Angular Momentum

Phys221_Wkst_Mar10 [PDF] - Rolling without Slipping

Phys221_Wkst_Mar09 [PDF] - Torque

Phys221_Wkst_Mar04 [PDF] - Rigid Body Motion

Phys221_Wkst_Mar03 [PDF] - Center of Mass and Velocity

Phys221_Wkst_Mar02 [PDF] - Momentum, Impulse, Collisions

Phys221_Wkst_Feb25 [PDF] - Exam 1 Review

Phys221_Wkst_Feb19 [PDF] - Mechanical Energy, PE Diagrams

Phys221_Wkst_Feb18 [PDF] - Mechanical Energy

Phys221_Wkst_Feb17 [PDF] - Work, Energy, Hooke's Law

Phys221_Wkst_Feb12 [PDF] - Work and Power

Phys221_Wkst_Feb11 [PDF] - Friction force, Newton's Laws

Phys221_Wkst_Feb10 [PDF] - Tension force, Newton's Laws

Phys221_Wkst_Feb05 [PDF] - Newton's Laws of Motion

Phys221_Wkst_Feb04 [PDF] - Newton's 1st and 2nd Laws of Motion

Phys221_Wkst_Feb03 [PDF] - Nonuniform circular motion, relative motion

Phys221_Wkst_Jan29 [PDF] - Uniform Circular Motion

Phys221_Wkst_Jan28 [PDF] - 2D Projectile Motion

Phys221_Wkst_Jan27 [PDF] - Constant Acceleration in 1D

Phys221_Wkst_Jan22 [PDF] - 1D Kinematics

Phys221_Wkst_Jan21 [PDF] - Vector Operations