# HP Cycle 13

## 11/19 - 11/24

F 11/19

M 11/22

T 11/23

W 11/24

### π’β 6: F 11/19, π΅β 8: F 11/19 - friction lab

Quiz on Newton's 2nd Law problems (including elevator problems) TODAY!

Today, we'll introduce the idea of quantifying friction. We'll talk about where friction is helpful (walking and braking) where it is not (in lab situations). We'll also talk about the difference between static friction and kinetic friction. We'll talk about how to increase the friction between two surfaces (think Mr. Miyagi from Karate Kid). Finally, we'll do a lab to find the mathematical relationship between the normal force and the force of friction.

Handout: Friction Lab - Write your responses on a separate sheet of paper to be turned in.

Virtual Alternative: LAB - Friction (virtual) if you are absent. Make a copy into your own Google Drive.

Homework: Finish what you can in the Friction Lab. Whole lab is due Tuesday for pd 8 and Wednesday for pd 6 next week.

### π© 6: T 11/23, π¦ 8: M 11/22 - friction recap

Today, if you haven't finished the friction lab, we'll start there for about 15-20 minutes.

Then, we'll begin considering friction in our problems by reviewing the concepts that we should have taken away from the lab and then formalize the concepts in Friction Powerpoint. We'll also do some sample problems in the Friction Powerpoint.

If there's any time remaining, you may start the problems from the next post.

Presentation: Friction Powerpoint

Homework: If you have any questions about the material presented today, watch the presentation below:

### π 6: W 11/24 (short), π 8: T 11/23 - β Positive Physics friction problems

Today, we'll finish going through the Friction PowerPoint if we haven't finished last time. Then, we'll work on on friction problems collaboratively. Work on β Positive Physics unit 6: friction "work" section (8 problems total) by Tuesday, November 30th:

• free-body diagram analysis

• complete problems 1

• complete problems 2

• challenge

Optional Extra Practice: #11-17 on page 2 of Big Newton's Law Packet. SOLUTIONS to pp 1-2 of Packet.

Homework: Finish β Positive Physics unit 6: friction "work" section (8 problems total) by Tuesday, November 30th at 10pm. Only completion score counts. No late work accepted.