# AT Cycle 11

## 11/10 - 11/15

W 11/10

Th 11/11

F 11/12

M 11/15

### π΄β 1: W 11/10, π‘β 3: W 11/10 - massive pulley problems (2)

Quiz on center of mass, moment of inertia, rotational kinematics, and tipping TODAY!

After the lab quiz, we'll continue working through the "massive pulley problems" that we started last time. We'll do these problems from Chapter 10:

Support: 49, 50
R
equired: 51, 53, 54, 55, 56, 69, 71, 98
Enrichment: 57, 87

Homework: Quiz on torque of friction lab Friday, November 12th. Finish any textbook problems you have not yet completed. Watch the first 18 minutes of this video about "Rolling Without Slipping", please do so. This video is very important for the next lesson.

### π₯β 1: F 11/12 lab, π¨ 3: Th 11/11 lab - βοΈ moment of inertia lab (1)

Pd 1: Lab Quiz on torque of friction lab TODAY!

Today, you'll focus on collaboratively carrying out an investigation to experimentally find the moment of inertia of the PVC-T. You may have to perform your experiment several times to engineer the best possible set-up to get good data. Your goal is to get a great graph or two. Screen shot your graphs and paste them into your Google Slides presentation (on Google Classroom) so that we can work with the graphs next time.

You may not take data unless the following are approved by me:

1. general procedure

2. how you plan to use time data (how are you going to use ALL the data?)

3. prediction of graph outputs

Remember, you may not ignore the torque of friction in this lab.

Lab Safety: If the PVC-T is spinning, it could hurt if it hits you. Please make to be aware when you are walking around the room that you do not walk into a spinning piece of equipment. Make sure to follow all other directions about equipment.

Homework: Also in your Google Slides presentation in βοΈ Google Classroom, make sure you have diagrams of set-ups (can be a photograph), free body diagrams, and prediction(s) for the graphs. Also, you should find an algebraic expression for your moment of inertia based on your free-body diagrams. Make sure you know how you will extract the necessary information from your graph. Consider your assumptions and sources of error before you try to analyze your data. If you got graphs, make sure they are in the Slides presentation!

### β€οΈ 1: M 11/15, πβ 3: F 11/12 - βοΈ moment of inertia lab (2)

Pd 3: Lab Quiz on torque of friction lab TODAY!

If you have not finished collecting data, focus on collaboratively carrying out the investigation to find the moment of inertia of the PVC-T. You may have to perform your experiment several times to engineer the best possible set-up to get good data. Your goal is to get a great graph or two.

If you have already finished collecting data and have printed your graphs, then we'll spend one whole period analyzing and interpreting the lab data. We'll first utilize the Identify and Interpret (I2) Strategy (from BSCS) to identify important features in our graphs. Then, we'll use the Writing Evidence-Based Body Paragraphs (from Rubano/McVay based on CER) organizer to help you start writing your paragraph about the data. We'll focus on the comparison between your predictions and your actual data and communicating similarities and differences. We'll also focus on writing a high quality evidence-based paragraph. You can use these two strategies for any paragraph in this or any other lab. You may even adapt these strategies for writing in your other subjects.

When you finish, work on your INDIVIDUAL write-up.

Homework: If you just finished getting data, make sure you have diagrams of set-ups, free body diagrams, and prediction(s) for the graphs in your lab notebook. Also, you should find an algebraic expression for your moment of inertia based on your free-body diagrams. Make sure you know how you will extract the necessary information from your graph. Consider your assumptions and sources of error before you try to analyze your data. If you got graphs, print them for next time!

Finish writing your analysis based on the strategies we discussed in class. INDIVIDUAL lab analysis is due to βοΈ Google Classroom by Wednesday, November 17th at 10:00pm. One question on the quiz will be to come up with a real-world application of moment of inertia and why you might want the moment of inertia of some object to be high er or lower. You'll get a bonus point if each person if you pick an application that 4 people or less (including you) in your class have chosen. (The application has to be a good demonstration of moment of inertia of course.) The open-notebook lab quiz will indeed be in the lab category as an assessment of your understanding of the lab.

Watch the first 18 minutes of the rolling without slipping video below: