## Thursday, February 15, 2018

### Data and Draft for Candidate Letter

In order to comment on the draft letter or to share links to information and data, those with eths202.org accounts can put in comments here. THANK YOU!!

## Tuesday, February 13, 2018

### Rotational motion introduction

This is for the 3 Chem/Phys classes. In addition to gravity and the pendulum, there is the transition from linear motion to rotational motion. Rotational motion is like spinning wheels, where every point of a full object spins. This is different from circular motion, which is motion of something we can treat as a point mass moving on a circular path.

For our pendulum lab, for instance, we treat this as circular motion because we are only considering the mass at the end, and ignoring the string. Technically, if we include the string, then we would need to discuss it in terms of rotational quantities.

These rotational quantities are introduced in this video. Check it out, take notes on the new symbols and terms and relationships - the relationships are analogues to what we do for linear motion. See if any of it makes sense with a few practice problems, which can be found in the 3 Chem-Phys page of the website, in the Rotations folder. The files is called

Try: Ch. 9 #1, 3, 7, 9, 11 Think about the similarities to linear motion problems we have had.

*For any groups that need to collect more data for the lab, go for it. If you need to do the force sensor part, we'll wait for Wednesday when the software is available.

For our pendulum lab, for instance, we treat this as circular motion because we are only considering the mass at the end, and ignoring the string. Technically, if we include the string, then we would need to discuss it in terms of rotational quantities.

These rotational quantities are introduced in this video. Check it out, take notes on the new symbols and terms and relationships - the relationships are analogues to what we do for linear motion. See if any of it makes sense with a few practice problems, which can be found in the 3 Chem-Phys page of the website, in the Rotations folder. The files is called

*Packet - Rotations Intro*. Some practice is on page 5. *Note that with rotational equations and values, we are converting into radians for angular measurements. Work together and talk things through.Try: Ch. 9 #1, 3, 7, 9, 11 Think about the similarities to linear motion problems we have had.

*For any groups that need to collect more data for the lab, go for it. If you need to do the force sensor part, we'll wait for Wednesday when the software is available.

## Tuesday, January 30, 2018

### From Kenya!

Using donations from some wonderful Wildkits, as well as uniforms donated by a Canadian soccer team (contacted by my friend and colleague Mark Reid), students at Makonjemare School in rural Kenya (near Kilifi, Kenya) have some new sporting gear, including soccer and volley balls. A sincere thank you to those who helped with this!!! As their teacher, Jacqueline Jumbe-Kehura told me, "Asante sana!" which is "Thank you very much" in Kiswahili.

## Sunday, January 28, 2018

### Methods being used to make AI creative

Getting a computer to be creative, to actually come up with its own, unique "thoughts" that it was not pre-programmed to do, is an enormous challenge for past artificial intelligence machines. But as is the case for most aspects of AI, progress has been made at impressive rates. Check out some of the methods being used for creative AI.

### Free Online Physics Course, Textbook

Check out Ck-12, and the free, online physics course and textbook. It has simulations, sample videos, and practice problems for the major topics in physics! There are also study guides for all topics. A wonderful supplement for what we do in class, or something to use if you are interested in topics we don't have time to study. You can also get a free account to access all the resources at CK-12; just use your student email, so you can access things from school.

## Friday, January 26, 2018

### Link to Infographic for MLA Citations

For any type of research paper, if you are using MLA citation formats, there are some really nice templates for different types of resources. Check them out if you ever forget or aren't quite sure.

## Wednesday, January 24, 2018

### For Wednesday

I am terribly sorry for missing again, but let's make the most of it. I'll make it up somehow.

Now that all the groups have observations and some data for RC circuits, we want to get a sense of the theory and math behind them. There are two cases for RC circuits in series: connecting a battery and charging the capacitor, and having a charged capacitor and then removing the battery so the capacitor discharges. Check out the following videos on your Chromebooks and take notes...you probably have guessed that, yes, we will all need to be able to do these derivations. Keep in mind that, for whatever reason, this is the same math that we used last year with air friction!

Watch this for CHARGING capacitors. Watch this for DISCHARGING capacitors.

After watching these, you can complete the lab (theory into reality, last part). After receiving the RC packets, give a try on the

We will start the process for our bridges. First, decide on who you will work with. To maximize your hands-on experience and have a chance to still talk through designs, we will work in pairs. However, you do have the option of working on your own if you wish to try.

Next, you have the period to go through the information passed out yesterday. Use the information for the various forces bridges experience, such as tension, stress, strain, compression, and so on - you will need to be able to define these. Then work on reaching a decision of design. Remember the specifications: the bridge will need to be between 30 cm and 40 cm in length, and span a 30 cm gap. Feel free to look online at designs, there should be lots of information since there are numerous bridge building contests around the country.

Keep in mind you will need to explain to Doc V and the class why you chose the design you ultimately make (think in terms of how forces are distributed in order to make the bridge stronger).

**Periods 3-4, 8-9:**Now that all the groups have observations and some data for RC circuits, we want to get a sense of the theory and math behind them. There are two cases for RC circuits in series: connecting a battery and charging the capacitor, and having a charged capacitor and then removing the battery so the capacitor discharges. Check out the following videos on your Chromebooks and take notes...you probably have guessed that, yes, we will all need to be able to do these derivations. Keep in mind that, for whatever reason, this is the same math that we used last year with air friction!

Watch this for CHARGING capacitors. Watch this for DISCHARGING capacitors.

After watching these, you can complete the lab (theory into reality, last part). After receiving the RC packets, give a try on the

*. If you have spare time, see what you think of the derivative calculator in the previous post....looks pretty cool.*__two AP problems on the second and third pages (2002, 2003)__**Period 6:**We will start the process for our bridges. First, decide on who you will work with. To maximize your hands-on experience and have a chance to still talk through designs, we will work in pairs. However, you do have the option of working on your own if you wish to try.

Next, you have the period to go through the information passed out yesterday. Use the information for the various forces bridges experience, such as tension, stress, strain, compression, and so on - you will need to be able to define these. Then work on reaching a decision of design. Remember the specifications: the bridge will need to be between 30 cm and 40 cm in length, and span a 30 cm gap. Feel free to look online at designs, there should be lots of information since there are numerous bridge building contests around the country.

Keep in mind you will need to explain to Doc V and the class why you chose the design you ultimately make (think in terms of how forces are distributed in order to make the bridge stronger).

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