Test Postponed

I decided to move the test to next class, so today is another work day.

The practice test, its key, and solutions videos are on yesterday's post.

Work Day

Today was a work day to study for your test, which is tomorrow.

Rotational Motion Test Practice

Answers

Solutions videos:

#2

#3

#4

#6

#8

#9

Orbits

Today we combined universal gravitation and uniform circular motion to find the mass of the sun given the radius and period of the orbit of the earth. Along the way, we basically derived Kepler's 3rd Law.

There is no homework, but you probably picked up your practice test today.

Rotational Motion Test Practice

Answers

Solutions videos:

#2

#3

#4

#6

#8

#9

Universal Gravitation

Today we used some fake data to derive the Law of Universal Gravitation (Newtonian graviation). Here is the activity: Universal Gravitation Pseudo-Lab.

Here is what ended up on the board:



And there weren't many good problems in the textbook, so I wrote some and put them on a little strip of paper: Universal Gravitation Homework.

After all of this, we attempted a demonstration that I've never tried before about the idea that gravity isn't really a force, exactly, but the consequences of bending space-time with large masses. This will not be assessed but it is the currently accepted model.

We also talked about gravitational waves, which are super exciting and the first detection of which was only a few years ago. Here is a pretty awesome video from Science Bulletin: Gravity-Making Waves. This was made before the first detection, though.

Science for Seniors!

Today three teachers came in to tell you about the science and engineering electives available for you to take your senior year:

• AP Physics C: Mechanics (1st semester) + Electricity and Magnetism (2nd semester) [powerpoint]
• AP Biology [powerpoint]
• AP Chemistry
• Advanced Research Methods [powerpoint]
• Engineering 102 (co-enrollment with UA and can earn UA credit) - see Mr. Schmidt for details

Lab: Finding g With Centripetal Force

Today we worked on the lab you picked up on Friday: Finding g With Centripetal Force. The FRQ from Friday is basically the background for this lab, so you first spent a few minutes correcting your own using a class set of the grading guide.

This lab should be done completely in your lab notebook - I will check it there. I won't make an effort to check it until after Thanksgiving, but if you finish it early I can check it early.

There is no additional homework.

Practice Problems

Today we just did some practice problems. They are homework if you didn't finish in class:

p. 228 #18, 20, 32, 65

You also picked up FRQ2009Bb1. This is also homework, but you will be correcting it yourself and keeping it on Monday/Tuesday. It is the basis for the lab you are doing on Monday/Tuesday, Finding g with Centripetal Force. Note: period is the time something takes to complete one cycle. For something moving in a circle, period is the time it takes to complete one rotation/revolution.

Banked Curves

Today we talked about  banked curves:

Notes: Banked Curves

Homework is p.231 #52. That one problem will probably take a whole sheet of paper.

Here is the work for the bellwork problem:

Centrifugal Force

Today we talked about centrifugal force, which isn't a real force but rather a result of a rotating reference frame. This topic won't be tested, but it's pretty fun to think about and demonstrate.

Any leftover time was spent working on tonight's homework: Chapter 7 (p. 228) #26 & 30

Centripetal Acceleration and Force

Today we introduced centripetal acceleration and centripetal force.

Notes: Centripetal Acceleration and Force

Homework is Chapter 7 (p. 228) #17 & 22

Below is the work for an example problem in the notes.

Rotational Kinematics Practice

I want to make sure you all are solid with using angular variables and rotational kinematics problems before we move forward, so today we simply practiced some tougher story problems. Whatever you didn't finish in class is homework:

p.227 #8, 9, 11, 69

Rotational/Linear Relationships

Today we learned the relationships between angular and linear position, velocity, and acceleration.

Notes: Relating Angular to Linear

Homework: Rotational Motion TIPERs #1

Rotational Motion

Today we learned about the angular quantities involved in rotational motion.

Notes: Angular Quantities

Homework is p. 227 # 1a, 4, 13

Energy Test Practice

First you voted on which of last night's homework to go through as a class. I may have asked a student to do the problem, depending on the class period (and if anyone felt comfortable enough to go up to the board). Then you started your practice test. Your test is next class, at the end of class, so you will have a little time to study beforehand. We'll also go over Energy TIPERs #7 very briefly at the beginning of next class.

Energy Practice Test

Here are some solutions videos from a couple of years ago (may not perfectly match energy practice test).

Multiple Choice #1
Multiple Choice #2
Problem #1
Problem #2
Problem #3

Below are the abridged answers.

Using Elastic Potential Energy in Energy Conservation Problems

Today we basically did several examples of energy problems that include springs:

Notes: Elastic Potential Energy and Energy Conservation

At the end of the period I asked you to finish Energy TIPERs #6, then we checked it together and you kept it. Please do not turn that in.

Homework tonight: p.160 #35, 39, 67. We will do one in class together tomorrow.

Here is the solution to the last problem in the notes: