AT Cycle 10

10/31 - 11/3

T 10/31

W 11/1

Th 11/2

F 11/3

🔴 2: W 11/1a, 🟡 4: T 10/31🎃, 🔵7: T 10/31🎃 - moment of inertia

Today, we'll spend the period first learning about what moment of inertia is and then trying to figure out how to calculate the moment of inertia of different objects.  We'll learn formulas for moment of inertia using a summation for discrete objects and then an integral for continuous bodies.  With any time remaining, start problems from the next post.

HomeworkQuiz on center of mass, rotational kinematics, and tipping - Wednesday, November 1st  Thursday, November 2nd for period 7 and Friday November 3rd for periods 2 and 4.  If you have any questions about the lecture today, you may watch my video lecture, and make sure you watch the part about parallel axis theorem starting at minute 33.

🟥 2: W 11/1b, 🟨 4: W 11/1, 🟦 7: W 11/1a - moment of inertia problems

Quiz on center of mass, rotational kinematics, and tipping TODAY.  (Postponed)

Today, we'll work on problems from Chapter 10 on calculating moment of inertia:

Support: 42
Required: 36, 38, 40, 43, G50, G42, G46
Enrichment: G49, G51

Homework:  Moment of inertia problems due on Friday, November 3rd at 10pm to ✏️ Google Classroom.  Watch the following video by Dan Fullerton on Rotational Dynamics.  Watch ONLY from 6:06 to 19:30!  Take your time working through these examples to really understand them.  It would be a good idea to have these examples written down in your notes.  Quiz on center of mass, rotational kinematics, and tipping - Wednesday, November 1st  Thursday, November 2nd for period 7 and Friday November 3rd for periods 2 and 4.  Quiz on moment of inertia Tuesday, November 7th.  

❤️ 2: Th 11/2, 💛 4: F 11/3a, 💙7: W 11/1b - massive pulley lab (1)

Daily Check-in: rotational dynamics

Today, we'll start with a brief check-in of rotational dynamics which you should have learned about in the video last night.  

Then, we'll investigate rotational dynamics more by looking at a particular torque - that of friction.

Is frictional torque a good thing or a bad thing?  Check out this video of a bow drill fire "engineer."

Sometimes, it's important to know exactly how much frictional torque there is in a system.  We'll do a lab where we try to calculate the torque of friction on the aluminum disk mounted on the wall.  This activity will require you to put together all of the pieces of rotational dynamics that we've been working with in the past couple weeks.  The lab write-up is in ↩️ Pivot Interactives "Finding the Torque of Friction (in-person)," although most of the lab will be done in person with the use of physical measurements and 🎞️ Vernier Video Analysis.  (If you are absent for this lab, you may do  ↩️ Pivot Interactives "Finding the Torque of Friction (virtual)" which does not require physical in-person measurements but rather requires you to make measurements from a video.)

Learning Goals of Massive Pulley Lab:

Massive Pulley Lab Requirements:

Safety considerations with the massive pulley lab:  

Follow all directions in the lab.  The Vernier caliper we'll be using has somewhat sharp edges, so be careful not to put it near anyone's eye or poke anyone's skin.  In order to make measurements, you might have to be taller.  Perhaps ask a taller student to collect measurements for your group or use the stepstool provided.  Do not use a chair or lab stool to stand on.  If you use the stepstool, have one other student assist you getting on and off.  They should also stand nearby spotting you to make sure you don't fall.  Don't do anything you're uncomfortable doing; call the teacher for assistance.

Homework:  Finish the lab in ↩️ Pivot Interactives by Sunday, November 5th at 10pm.  Quiz on center of mass, rotational kinematics, and tipping - Wednesday, November 1st  Thursday, November 2nd for period 7 and Friday November 3rd for periods 2 and 4.  Quiz on moment of inertia Tuesday, November 7th.  Lab quiz on Massive Pulley Lab ALSO on Tuesday, November 7th.  

📕❗ 2: F 11/3, 📒❗ 4: F 11/3b, 📘❗7: Th 11/2 - massive pulley lab (2)

Quiz on center of mass, rotational kinematics, and tipping TODAY.  

Today, we'll continue our lab on rotational dynamics.

Homework:  Finish the lab in ↩️ Pivot Interactives by Sunday, November 5th at 10pm.  Quiz on moment of inertia Tuesday, November 7th.  Lab quiz on Massive Pulley Lab ALSO on Tuesday, November 7th.