# GAVS Physics AB Course Resources

## Module 3: Two-Dimensional Motion

## Instructor Information

Email: Emily.Kroutil@gavirtualschool.org

Phone: 470-238-8663 (voicemail)

**MODULE 3: Two- Dimensional Motion**of your course content. You should first go through the content and complete the quizzes and activities. These resources are to supplement your understanding of the concepts. Please contact me if you have questions! In physics, it is essential that you understand these concepts before moving on.

## ASSIGNMENT RESOURCES AND TIPS

## DISCUSSION: When do I use Vectors?

- Make sure you answer ALL questions in the prompt AND respond to two classmates.
- You will only earn a maximum of 70% if you do not
**thoughtfully**respond to two classmates.

## LAB: Vector Addition

- The handout for this lab can be found on page 3 of the content.
- You can view the lab rubric in the lab's dropbox folder. Following the rubric is the BEST WAY to make sure that you earn full points on your lab.
- This lab requires that you show your work for your calculations. You WILL lose points if you do not show your work. Please see the rubric so you know EXACTLY what you need to do to earn full points.

**Question:**How do I know if the vector should be positive or negative?**Answer:**Draw the components! This will let you know what you should be looking for in terms of your vector's magnitude/direction. I show you how I draw them in this video: https://youtu.be/x4FQIXIj66o

**Question:**What does it mean in question 2 when the directions say "recreate"?**Answer:**The directions want you to draw the vectors in the simulation as best you can. Alternatively, you can include a screenshot of your vectors in the simulation for question 2.

**Question:**Care to shed some light on how to solve for the vectors in the Vector Examples section?**Answer:**Please see the image above (click it to make it larger) for help calculating the vectors.

**Question:**What are the A and 0 in the equation Ax=Acosθ if my data table has |R|, Rx, Ry?**Answer:**If you go to 10:45 in the video, it shows you how to enter the numbers, but basically Ax = A cosθ --> Rx = |R|cosθ, so on your data table |R| = A.

**Question:**tan-1 θ = (9/1)θ= arctan (9)

this is what my calculator said, it came out with the word arctan on it. Do I just put 9 degrees or include the whole thing, arctan (9)?**Answer:**I work through this at about 16:00 in the video below. For this one, you will need to enter Tan-1 in your calculator to get the correct answer. You will see this in your calculator as atan/arctan/tan-1. So you'll need to type arctan(9) into your calculator to get the correct answer.

- I walk you through the lab in this video: https://youtu.be/dxKzYhXiawY

**Q: I'm having trouble getting the site to work. What should I do?****A:**If your computer has issues with accessing the Phet activities you MUST get this straightened out in order to submit the work, and these labs are required with no alternative assignments available.**Unfortunately, this is not something that I am able to help with, but a problem that you will need to find a solution to.****If you wait until the day the assignment is due to try to access the site and you have problems, you will not be able to get the assignment submitted on time, so it is important that you access this site ahead of time so that you'll either know you don't have problems, or you will have time to get the problems fixed before the assignment is due.****Being able to access this site and the activities there is a requirement of the course and it is your responsibility to make sure that you have access.**This the help site for Phet: https://phet.colorado.edu/en/help-center/running-sims. This is a blog post that a parent shared with me. The information here enabled her son to solve his computer's problems: https://blogs.windows.com/msedgedev/2016/12/14/edge-flash-click-run/

## QUIZ: Vectors

- Make sure you do the practice problems before you take the quiz. The vectors practice problems and solutions can be found on page 3 of the content
- If the quiz has a short answer problem that makes you do math, you MUST show your work in order to earn full credit.
**Content Error:**On page 3 of the content, the 19th slide has an error. You need to use inverse tangent to solve for theta. Please see the image to the right (click on it to make it larger) for a corrected slide.

**Question:**My calculator keeps giving me different answers (small decimals) when I try and solve for theta?**Answer:**Your calculator MUST be in DEGREES, not RADIANS. An iPhone calculator WILL NOT give the right answer. You must download a graphing calculator app if you want to use your phone or tablet to do the calculations.

## LAB: Projectile Motion

- The lab handout can be found on page 4 of the content.
- You can view the lab rubric in the lab's dropbox folder. Following the rubric is the BEST WAY to make sure that you earn full points on your lab.
- This lab requires that you show your work for your calculations and draw sketches when asked. You WILL lose points if you do not show your work or draw the requested sketches. Please see the rubric so you know EXACTLY what you need to do to earn full points.
- I walk you through the lab in this video: https://youtu.be/GwS7SodFBTw

**Q: I'm having trouble getting the site to work. What should I do?****A:**If your computer has issues with accessing the Phet activities you MUST get this straightened out in order to submit the work, and these labs are required with no alternative assignments available.**Unfortunately, this is not something that I am able to help with, but a problem that you will need to find a solution to.****If you wait until the day the assignment is due to try to access the site and you have problems, you will not be able to get the assignment submitted on time, so it is important that you access this site ahead of time so that you'll either know you don't have problems, or you will have time to get the problems fixed before the assignment is due.****Being able to access this site and the activities there is a requirement of the course and it is your responsibility to make sure that you have access.**This the help site for Phet: https://phet.colorado.edu/en/help-center/running-sims. This is a blog post that a parent shared with me. The information here enabled her son to solve his computer's problems: https://blogs.windows.com/msedgedev/2016/12/14/edge-flash-click-run/

## QUIZ: Projectile Motion and Uniform Circular Motion

- Make sure you do the practice problems before you take the quiz. The projectile practice problems and solutions can be found on page 4 of the content. The uniform circular motion practice problems and solutions can be found on page 5 of the content.
- If the quiz has a short answer problem that makes you do math, you MUST show your work in order to earn full credit.
- If you feel like you need more practice with projectiles, I have the following practice problem sets posted under User Links in the course: Horizontal Projectiles Extra Practice, Horizontal Projectiles Extra Practice KEY, Angled Projectiles Extra Practice, Angled Projectiles Extra Practice KEY
**Content Error:**The solution for practice problem 1C on page 4 of the module is incorrect. The correct solution is in the image above (click to make it larger). These videos from Khan Academy do a great job explaining how to work out these types of problems: Launching and Landing on Different Elevations, Total Final Velocity for Projectile

## TEST: 2D Motion

- A great way to study for the test is to go back and look at the quiz questions you missed.
- If the quiz has a short answer problem that makes you do math, you MUST show your work in order to earn full credit.
**What does showing your work look like? Read this!** - After you finish your test, be sure to review what you missed, and look for the News announcement outlining test correction procedures.