# AT Cycle 4

## 9/23 - 9/29

F 9/23

T 9/27

W 9/28

Th 9/29

### π΄ 2: T 9/27a, π‘ 4: F 9/23 - circular & friction problems (2)

Today, we'll first finish the required problems on more advanced Newton's Law from Chapter 6 in Halliday and one problem from Giancoli Chapter 5:

Support: 17, 25, 27, 35, 45, 70
Required: 23, 34, 51, 57, 58, 60, 68, 98, G42
Enrichment: 21*, 22, 25, 59, 103
* Requires calculus, skip if you haven't taken it yet.

We'll also finish figuring out how fast we could go around the Bristol Motor Speedway in Nascar Problem. You'll learn about how to approach banked turn problems. We'll work in groups to try to figure it out.

If you've already finished these required problems, you will be making a video of one of the harder problems from either Halliday Chapter 5 or Chapter 6 to help your classmates. You can post it in the Stream on βοΈ Google Classroom.

And check this out...

NASCAR problems banked tracks.doc

### π₯ 2: T 9/27b, π¨ 4: T 9/27 - circular & friction problems (3)

Keep working collaboratively on the circular and friction problems from the post above. You will be assessed informally as I have discussions with you individually or in small groups.

Homework: Make sure you have completed both the Nascar Problem AND the required problems from Ch 6/G5. βNext assessment on Dynamics - Thursday, September 29th (does not include energy). If you have not yet finished watching the energy video from the previous post, make sure you do that before next hour.

You may have already done this last weekend, but if you have not, this is important: In order to prepare for the lab we'll do early next week, watch the video below to review how to solve work/energy problems - Giancoli Chapter 8 #27. The important thing in this video is to make sure that you understand how to make a "before & after energy diagram." This method of solving energy problems is not something that is universal amongst physics teachers, but I do think that it is helpful and virtually foolproof, so I would like to see you use it. In addition, you should be able to use the conservation of energy equation to solve energy problems. This method is different than the "Work-Energy Principle" method, so you might want to also look that up in your textbook (p. 153 Halliday) and understand how it differs from the "conservation of energy" method. Both methods work, but given the situation, one usually works better than the other. Figure out why.

For those of you who are curious, watch the video below about the dot product:

### β€οΈ 2: W 9/28, π 4: Th 9/29a - energy conservation

Daily Check-in #5: Energy Conservation

With whatever time is remaining after the check-in, we'll start the conservation of energy lab.

We'll continue review of last year's material by doing a lab with energy. You'll need to find the coefficient of kinetic friction between a wooden block and the lab table. The only measurement devices are a meter stick and a balance. You cannot use any timing devices or motion sensors. You'll focus on work lost to a non-conservative force.

Homework: Study for βAssessment on Dynamics next class - Thursday, September 29th. (does not include energy)

### πβ 2: Th 9/29, πβ 4: Th 9/29b - dynamics assessment

βDynamics Assessment TODAY!

Homework: Make sure you've reviewed energy.