## Two notes about in-class assessments

September 25, 2017
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- Units. If you write down a numerical value, be sure to include the units (if it has units). This is your last warning. I will count off points in the future. Oh, don’t worry about units on numbers in your calculations – but be sure to include on the final answer.
- Vector notation. Don’t write a vector as a scalar. Don’t write a scalar as a vector. Vectors and scalars are different.

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## Ch 4 HW

September 18, 2017
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Chapter 4: 21, 22, 25, 30, 32, 35, 40, 45, 48, 50, 62

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## Rotate your videos

September 15, 2017
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Please don’t send me links to videos that make me watch with my head turned sideways. You can fix these problems very easily – here’s how.

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## Numerical Calculations Standard

September 13, 2017
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Now is the time for the vpython standard (I am now calling it the Numerical Calculations standard). I am making it due on October 16 – 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

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