# AT Cycle 2

## 9/12 - 9/17

Th 9/12

F 9/13

M 9/16

T 9/17

### 🔴 2: Th 9/12, 🟡 4: Th 9/12, 🔵 8: Th 9/12 - Newton's Second Law problems (part 1)

We'll continue to go through the solutions to the first Daily Check-in.

If there's time, we'll work independently and collaboratively on problems pertaining to Newton's Laws from Chapter 5 in our new Halliday textbook and Chapter 4 in our old Giancoli textbook (indicated with a G) starting at your level. I will assess your understanding individually and answer your questions as I circulate the room.

Support: 41, 48, 49, 51, 53, 56, 57

Required: 13, 56, 58, 64, G54, G55, G66, G75

Enrichment: 59, 67

Homework: Don't forget to watch the video which was assigned last time. Continue attempting and working through required problems above. ❗Summer Assessment on Wednesday, September 18th Tuesday, September 24th.

### 🟥 2: M 9/16 lab, 🟨 4: F 9/13 lab, 🟦 8: F 9/13 lab - Newton's Second Law problems (part 2)

Daily Check-In #2: Friction (7: M 9/18)

After a super brief daily check-in based on the friction video, we'll work independently and collaboratively on problems pertaining to Newton's Laws from Chapter 5 in our new Halliday textbook and Chapter 4 in our old Giancoli textbook (indicated with a G) starting at your level. I will assess your understanding individually and answer your questions as I circulate the room.

Support: 41, 48, 49, 51, 53, 56, 57

Required: 13, 56, 58, 64, G54, G55, G66, G75

Enrichment: 59, 67

Homework: Finish working through required problems. ❗Summer Assessment on Wednesday, September 18th Tuesday, September 24th.

If you have already tried Giancoli #54 and are stuck, check out my solution video below. (Please make sure you try this problem before you watch the video!) There are thinking steps missing in my video. Would you have known what to do? How did I know how to solve the problem this way? What strategies would you employ to get to this solution? These questions and possible strategies should be included in your How-To Guide.

If you can't work out the algebra on #55, don't worry about it. Below is the Solution to #55 so that you can get some assistance setting it up. (Click to enlarge) Try to figure out what generalizations you can make for yourself about how to tackle a hard problem like this. Make sure you are able to do all other required problems. Look through the problems, and make sure you understand them enough to present/make a video next class.

Giancoli Answers:

54. (m1 + m2 + m3)m2g / (m12 – m22)1/2

55. see picture above

66. a) (m2 - m1 sin θ) g / (m1 + m2)

b) a down (negative) requires m2 < m1 sin θ.

a up (positive) requires m2 > m1 sin θ

75. F = FT1 = FT2 = 1/2 Mg, FT3 = 3/2 Mg, FT4 = Mg

Additional Required Homework: Watch the two videos and answer the questions ✏️ in Google Classroom by Sunday at 10pm for periods 4 & 8 and Monday at 10pm for pd 2:

Nascar Experience Driver View - Do not watch this whole video - skip to anywhere in the middle and watch at least one minute. Pay attention to going around curves. Audio doesn't matter.

Bobsleigh Speed Record - Watch this entire video

### ❤️ 2: T 9/17, 💛 4: M 9/16, 💙8: M 9/16 - circular & friction problems (1)

Daily Check-In #3: inclined plane

Today, after the daily quiz, you'll finish working on basic Newton's Laws problems from the last post, and then you will be working on some additional problems on more advanced Newton's Laws concepts 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.

I'll assess your understanding through conversations with you.

Homework: Make sure you've completed the first set of required problems. Continue with the problems from the post above. ❗Summer Assessment on Tuesday, September 24th. ❗Assessment on Chapters 5 and 6 in Halliday plus banked turns on Monday, September 30th.