# AT Cycle 4

## 9/29 - 10/4

W 9/29

Th 9/20

F 10/1

M 10/4

### π΄β 1: W 9/29, π‘β 3: W 9/29 - Dynamics Assessment

Dynamics Assessment TODAY!

Homework: 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:

### π₯ 1: F 10/1 lab, π¨ 3: Th 9/30 lab - energy lab #1

Today, we'll do a lab in β©οΈ Pivot Interactives called "Stopping Distance (Scaffolded) BCF." The goals of the labs are:

• Review how to perform conservation of energy problems.

• Review how to linearize graphs and find unknown values from mathematical relationships.

• Familiarize yourself with Pivot Interactives as an online lab tool.

You'll work collaboratively this hour to try to complete this online lab. In typing your answers in Pivot Interactives, you might find it helpful to insert formulas in your responses. Learn how to do that in Pivot Interactives HERE.

Homework: If you have not finished the β©οΈ Pivot lab, complete it for homework by Sunday, October 3rd at 10pm.

### β€οΈ 1: M 10/4, π 3: F 10/1 - energy lab #2

LAB SAFETY: Students will be using a modified Atwood machine, and if heavy masses are used, injury could result if they fall on a foot. Please pay attention to all lab instructions, and only use equipment for their instructed use.

Today, 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. If you finish early, you should try to find an expression for the coefficient using another method - Newton's Laws.

Homework: Make sure your "lab write-up" completed on a separate piece of paper to be turned in. It's not a formal write-up. Give it a title, and make sure you have a labeled diagram of what you measured. Make sure to have some "before-and-after diagrams." Then just your measurements and calculations. This lab is due in class on Tuesday, October 5th.