## Chapter 3 HW

Chapter 3: 16, 18, 21, 25, 27, 33, 42, 45, 47, 50, 52, 64

## Chapter 2 HW

Chapter 2: 11, 13, 15, 18, 21, 24, 30, 34, 38, 48

## Numerical Calculations Standard

Now is the time for the vpython standard (I am now calling it the Numerical Calculations standard). I am making it due on Feb 15 – so you have some time. Here is what I want:

A 5 minute or less screen cast that shows me a numerical calculation. I would suggest using VPython (or Glowscript or trinket.io), but you can use whatever you want. Here are some notes:

- Here is a rough scoring guide:
- 5 points: this is a numerical solution to an interesting problem that can’t be solved analytically. Also, the screen cast will include evidence that suggests the calculation is valid (like looking at the extreme cases of low mass or whatever)
- 4 points: this is a numerical solution for a problem with non constant forces
- 3 points: this is a numerical solution for something fairly trivial, like a constant force motion

If you go through the tutorials I posted on moodle, you should be able to at least get a 4. Here are some other notes:

- I hate to make you create a screencast, but I think this is the best.
- You need to show your screencast to two other people before you send it to me.
- One way to share your screencast would be to just post the link in moodle.
- If you absolutely don’t want to make a screencast, you can show your program in class instead.
- Don’t forget to submit this on time. If you do, you can always fix stuff and resubmit it.
- If you get stuck, ask for help.
- Numerical example https://www.wired.com/?p=1766358
- Repeat of what we did in class (essentially) https://www.wired.com/2014/07/how-do-you-model-a-spring/
- A tutorial-style thing on numerical calculations – https://trinket.io/rhettallain_gmail_com/courses/introductory-physics-with-python#/introduction/constant-velocity

## Equations for chapter 2

I don’t expect you to memorize everything. I will try to let you know what things you need to remember and what I will give you. For chapter 2, here are the equations that will be provided.

## Spring 2017

Welcome to the Spring 2017 section of PHYS 221. Let me point out a few (hopefully useful) notes:

- The syllabus is linked at the top. Read it.
- We will use the textbook Matter and Interactions – use it.
- I have created some homework quizzes in moodle. These are designed to check your reading of the material.
- There are TONS of videos to help you with the material. The videos link above has a list of videos.
- The primary objective of class time (the time that we meet) is to work on difficult things. If you don’t read the textbook beforehand, class time might be useless to you.
- In the past, I asked students to write notes to future students to help them with the class. Since you are the future students (according to them), this is for you. Advice for future students.