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  2. Centripetal Acceleration Introduction

    Why is there a “center seeking” centripetal acceleration? A step-by-step walk through of the answer to this question. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 Which mint has the largest angular velocity? 1:14 What do we know about the angular and tangential accelerations of the mints? 2:21 What do we know about the tangential velocity of mint #3? 3:39 Centripetal acceleration introduction 4:44 The centripetal acceleration equations 5:35 The units for centripetal acceleration Multilingual? Please help translate Flipping Physics videos! Previous Video: Demonstrating the Directions of Tangential Velocity and Acceleration Please support me on Patreon! Thank you to Christopher Becke and Aarti Sangwan for being my Quality Control Team for this video.
  3. Name: Centripetal Acceleration Introduction Category: Rotational Motion Date Added: 2017-08-21 Submitter: Flipping Physics Why is there a “center seeking” centripetal acceleration? A step-by-step walk through of the answer to this question. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 Which mint has the largest angular velocity? 1:14 What do we know about the angular and tangential accelerations of the mints? 2:21 What do we know about the tangential velocity of mint #3? 3:39 Centripetal acceleration introduction 4:44 The centripetal acceleration equations 5:35 The units for centripetal acceleration Multilingual? Please help translate Flipping Physics videos! Previous Video: Demonstrating the Directions of Tangential Velocity and Acceleration Please support me on Patreon! Thank you to Christopher Becke and Aarti Sangwan for being my Quality Control Team for this video. Centripetal Acceleration Introduction
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  5. Name: How to Get the Most Out of Studying: Part 5 of 5, "I Blew the Exam, Now What?" Category: Introductory Concepts Date Added: 2017-08-20 Submitter: FizziksGuy How to Get the Most Out of Studying: Part 5 of 5, "I Blew the Exam, Now What?"
  6. Name: How to Get the Most Out of Studying: Part 4 of 5, "Putting Principles for Learning into Practice" Category: Introductory Concepts Date Added: 2017-08-20 Submitter: FizziksGuy How to Get the Most Out of Studying: Part 4 of 5, "Putting Principles for Learning into Practice"
  7. Name: How to Get the Most Out of Studying: Part 3 of 5, "Cognitive Principles for Optimizing Learning" Category: Introductory Concepts Date Added: 2017-08-20 Submitter: FizziksGuy How to Get the Most Out of Studying: Part 3 of 5, "Cognitive Principles for Optimizing Learning"
  8. Name: How to Get the Most Out of Studying: Part 2 of 5, "What Students Should Know About How People Learn" Category: Introductory Concepts Date Added: 2017-08-20 Submitter: FizziksGuy How to Get the Most Out of Studying: Part 2 of 5, "What Students Should Know About How People Learn"
  9. Name: How to Get the Most Out of Studying: Part 1 of 5, "Beliefs That Make You Fail... Or Succeed" Category: Introductory Concepts Date Added: 2017-08-20 Submitter: FizziksGuy How to Get the Most Out of Studying: Part 1 of 5, "Beliefs That Make You Fail... Or Succeed"
  10. Name: AP Physics C 2017 Mechanics Free Response Solutions Category: Exam Prep Date Added: 2017-08-20 Submitter: FizziksGuy Walk-through of the 2017 AP Physics C: Mechanics Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit APlusPhysics.com. You can also check out the new AP Physics C Companion: Mechanics, a guide book designed to assist in your studies of AP Physics C: Mechanics. Both black-and-white and full-color versions available from Amazon.com: http://amzn.to/2vPCvB3*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics C 2017 Mechanics Free Response Solutions
  11. Walk-through of the 2017 AP Physics C: Mechanics Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit APlusPhysics.com. You can also check out the new AP Physics C Companion: Mechanics, a guide book designed to assist in your studies of AP Physics C: Mechanics. Both black-and-white and full-color versions available from Amazon.com: http://amzn.to/2vPCvB3*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.
  12. Name: AP Physics C 2017 E&M Free Response Solutions Category: Exam Prep Date Added: 2017-08-20 Submitter: FizziksGuy Walk-through of the 2017 AP Physics C: Electricity and Magnetism Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit http://APlusPhysics.com.*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics C 2017 E&M Free Response Solutions
  13. Walk-through of the 2017 AP Physics C: Electricity and Magnetism Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit http://APlusPhysics.com.*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.
  14. Name: AP Physics 1 2017 Free Response Solutions Category: Exam Prep Date Added: 2017-08-20 Submitter: FizziksGuy Walk-through of the 2017 AP Physics 1 Free Response Questions. Questions can be found at https://secure-media.collegeboard.org...For more information, please visit http://aplusphysics.com*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics 1 2017 Free Response Solutions
  15. Walk-through of the 2017 AP Physics 1 Free Response Questions. Questions can be found at https://secure-media.collegeboard.org...For more information, please visit http://aplusphysics.com*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.
  16. Name: AP Physics 2 2017 Free Response Solutions Category: Exam Prep Date Added: 2017-08-20 Submitter: FizziksGuy Walk-through of the 2017 AP Physics 2 Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit http://aplusphysics.com.Looking for help in AP Physics 2? Check out my course guidebook, AP Physics 2 Essentials: An APlusPhysics Guide! http://amzn.to/2vPMA0H*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics 2 2017 Free Response Solutions
  17. Walk-through of the 2017 AP Physics 2 Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....For more information, please visit http://aplusphysics.com.Looking for help in AP Physics 2? Check out my course guidebook, AP Physics 2 Essentials: An APlusPhysics Guide! http://amzn.to/2vPMA0H*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.
  18. So, it’s been a few years since I’ve detailed how I make my screencasts, and my workflow and equipment have evolved as I’ve added a few bells and whistles in an attempt to make the screencasts look a touch more professional (and more fun). Some things have stayed the same, and others, well, not so much. Here’s the basic workflow. The Computer 27″ iMacI’m still working on a Mac platform, doing most of my work on a 27-inch 2013-vintage iMac. I try to keep up to date with the latest version of the operating system, which is currently OS X Sierra. The iMac includes the higher-end graphics card (NVIDIA GeForce GTX 780M 4096 MB), has an i7 processor, and I’ve installed 32 GB of RAM. Typically when I purchase a computer I shoot for a five to six year productive life span, at which point I’ll upgrade to a newer model. This has worked pretty well for me with respect to my Mac laptops (a MacBook Pro), as the last one was in service for about six years, but I’m anticipating this iMac may continue well past that mark. It still looks beautiful, runs quickly, and with the amount of RAM and the built-in Fusion Drive, its performance doesn’t appear to be in any danger of slowing down in the near future. Pen Displays Wacom Cintiq 22HDAttached to the iMac I have a Wacom Cintiq 22HD pen display unit, which is basically an external monitor that I can “write on” with a special pen, allowing me to annotate the screen as I talk through the video. I’ve previously used a Wacom DTU-1631, and am looking forward to trying out the newly-released Wacom Cintiq Pro 16 with a USB-C enabled MacBook Pro. Though the Wacom pen displays are a very significant investment, I’ve been very impressed with their quality and longevity. The DTU-1631 has lasted five years in the classroom with heavy daily use, and the Cintiq 22HD is just shy of five years of service (though a much lighter workload) and could easily pass for brand new. These monitors also hold their value extremely well over time. Audio & Video Blue Yeti MicrophoneI’ve gotten a ton of mileage out of my Blue Yeti USB microphone… I’ve tried a number of other mics, including lapel mics, and microphones that cost more than three or four Blue Yeti’s, but I haven’t found anything that compares to the quality of the Blue Yeti, especially at its very reasonable price point. If you want to upgrade your audio from the built-in microphones, this is a very solid choice, and another piece of electronics that has held up well for more than five years of service. Canon Vixia HF G20I’ve put together a small office in my basement to allow for a fairly quick and seamless transition to video creation mode, which includes a foam green screen (and stand). Especially if you’re just getting started, something as simple as a green flannel blanket can work, though I have to admit, the foam green screen has held up extremely well these past few years (even with the dog sleeping on the portion that sits on the floor at least daily). They sell rather expensive lighting clips to hold the green screen to the stand, but I found quality clips at a much more reasonable price at the local hardware store. Genaray SpectroLEDFor illumination, I use a couple of super-cheap reflector work lights coupled with a Utilitech Pro floor LED and a Genaray SpectroLED SP-E-240D mounted on the ceiling. With a little bit of playing, I can obtain pretty reasonable uniform green screen illumination. I also use a couple of desktop clip-on lamps to illuminate the foreground (i.e. — my face) in the videos. To record my face in the videos, I’m using a Canon Vixia HF G20, saving the digital video file onto an SD card. Most any digital camcorder or webcam can do the job, however. While the Canon is recording my face, I’m separately using the iMac and Telestream’s Screenflow 6 (Telestream JUST released Screenflow 7, but I haven’t tried it out yet) to record the Wacom Cintiq screen, as well as recording the input from the Blue Yeti microphone. Recording Prior to any recording, however, I create my “slides” for the screencasts using Apple’s Keynote software, and export those slides as a PDF. I then open the PDF using Zengobi’s Curio software, which is the software actively running on the Wacom screen that I use to annotate the slides. If you haven’t tried it out, Curio is a pretty amazing piece of software that allows you to do so much more than just write on PDF slides… if you have a Mac, it’s worth checking out for a variety of purposes! So, the workflow. With everything set up, I have Screenflow 6 start recording the Wacom screen while recording the Blue Yeti mic, and simultaneously I start up the Canon video camera. Once I’ve gone through the lesson, I stop Screenflow from recording and stop the Canon video camera. I should now have an SD card that contains the digital video file of my face (with sound recorded from the Canon’s rather poor microphone), and a Screenflow 6 file that has video from the Wacom screen coupled with the Blue Yeti-recorded sound. Now it’s time to put the video all together. First I export the digital video file from Screenflow 6, taking care to export at 29.97 fps and not 30 fps so that it will match up to the Canon digital video file. Then, using Final Cut Pro on the Mac (coupled with the Motion and Compressor add-ons), I create a project and import both the recorded screen video file and the video camera file. Using Final Cut, I create a combined clip from these two files and have Final Cut Pro sync them up based on the audio (although the sound from the Canon camera is poor, it’s good enough to sync the clips together). Next, I mute the sound from the Canon camera, so that I now have my recorded screen video below my “live action” video, but using only the sound from the recorded video screen, which was recorded with the Blue Yeti mic. Editing Chroma Key EffectNext it’s time to edit. First step is to take care of the green screen effect (formally known as chroma key), which Final Cut Pro does quite easily. I remove the green color from the “live action” file using the “Keyer” effect, and tweak it as needed to get the desired result. I then shrink the clip down and position it where I want, so that I have the live video taking up just a small portion of the screen, the background green from the video shows as transparent, and what shows through from underneath is the recorded video from the Wacom screen. The hard part’s done. Final steps now involve fixing any audio issues, clip editing if necessary, adding any titles, and appending on the opening and closing video sequences, which were created using Adobe Premiere Pro, After Effects, and Audition from Adobe Creative Cloud. Once I have the video looking the way I want in Final Cut Pro, I use Compressor to export it in multiple formats — high definition video for YouTube, and an APlusPhysics-specific size and quality for viewing directly from the APlusPhysics site. Next Steps Moving forward, I would really like to spend some time working with my old iPad to see if I can re-purpose it for use as a teleprompter. I tend to spend a lot of time up front planning my videos, but still have yet to come up with a slick, efficient way of presenting notes to myself while I’m making a video. I have to believe there’s a reasonable way to have my notes show up on my iPad and use some sort of remote (perhaps my phone?) to scroll through PDF notes on my iPad as necessary. Currently I tend to tape my paper notes to the bottom of the camera, which is chock-full of problems, messiness, and opportunity for improvement. Back to Reality If it sounds like there’s quite a bit of work involved, you’re not wrong, but don’t think you have to go to anywhere near this level of complexity or expense to make quality screencasts. My workflow has evolved over the years as I’ve tinkered and gone through a length set of try/fail sequences to learn what works for me and provides the level of quality I’m after. Much of what I do can be accomplished in a similar manner using fairly basic tools — Techsmith’s Camtasia software coupled with a Webcam, a USB lapel mic, and most any digitizing tablet will get you pretty solid results without a huge investment. Even though this article is a technical how-to / what do I use, I’d still like to end with two bits of advice I’ve learned from doing things the hard way more times than I can count. First, and foremost, a flipped classroom is NOT about the videos, it is about building more in-class time for active learning strategies such as hands-on activities, group problem solving, deep-dives into a topic, discussions, etc. The videos themselves are such a tiny part of the whole equation, and are primarily a means to create more available class time. Second, though it can be fun to doctor-up your videos and add all sorts of bells and whistles, realize that these embellishments and investments of time and resources have extremely minimal payback in the form of student learning and performance. If you’re interested in doing these things, make sure you’re doing them because you want to and think it’s going to be fun, but don’t expect to see any sort of substantial learning improvement with higher quality videos (which brings me back to item one… it’s not about the videos!) Useful References Video: Developing a Successful Flipped Classroom Video Series: How to Get the Most Out of Studying (Dr. Chew) The post Creating Screencasts (Mac) – 2017 Update #edtech #flipclass appeared first on Physics In Flux.
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  20. Name: Demonstrating the Directions of Tangential Velocity and Acceleration Category: Rotational Motion Date Added: 2017-08-13 Submitter: Flipping Physics The best way to understand how tangential velocity and tangential acceleration are related is to visualize from above. Will you look at that! This video does exactly that. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:10 Visualizing up the three parts of the demonstration 0:51 Visualizing the tangential velocities 1:41 Visualizing the tangential accelerations 3:11 Visualizing tangential velocities and accelerations simultaneously 4:52 Angular vs. Tangential quantities Multilingual? Please help translate Flipping Physics videos! Previous Video: Tangential Acceleration Introduction with Example Problem - Mints on a Turntable Please support me on Patreon! Thank you to Christopher Becke and Natasha Trousdale for being my Quality Control Team for this video. Demonstrating the Directions of Tangential Velocity and Acceleration
  21. The best way to understand how tangential velocity and tangential acceleration are related is to visualize from above. Will you look at that! This video does exactly that. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:10 Visualizing up the three parts of the demonstration 0:51 Visualizing the tangential velocities 1:41 Visualizing the tangential accelerations 3:11 Visualizing tangential velocities and accelerations simultaneously 4:52 Angular vs. Tangential quantities Next Video: Centripetal Acceleration Introduction Multilingual? Please help translate Flipping Physics videos! Previous Video: Tangential Acceleration Introduction with Example Problem - Mints on a Turntable Please support me on Patreon! Thank you to Christopher Becke and Natasha Trousdale for being my Quality Control Team for this video.
  22. Name: Tangential Acceleration Introduction with Example Problem - Mints on a Turntable Category: Rotational Motion Date Added: 2017-08-08 Submitter: Flipping Physics Tangential Acceleration is introduced and visualized. Example problem is worked through. We even relate arc length, tangential velocity, and tangential acceleration via the derivative! Example: A record player is plugged in and uniformly accelerates to 45 revolutions per minute in 0.85 seconds. Mints are located 3.0 cm, 8.0 cm, and 13.0 cm from the center of the record. What is the magnitude of the tangential acceleration of each mint? Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:21 The tangential acceleration equation 0:55 Translating the example problem 2:13 Solving for angular acceleration 3:02 Solving for tangential accelerations 4:16 Visualizing the tangential accelerations 5:05 Using the derivative to relate arc length, tangential velocity, and tangential acceleration Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Tangential Velocity Problem - Mints on a Turntable Please support me on Patreon! Thank you to Christopher Becke and Natasha Trousdale for being my Quality Control Team for this video. Tangential Acceleration Introduction with Example Problem - Mints on a Turntable
  23. Tangential Acceleration is introduced and visualized. Example problem is worked through. We even relate arc length, tangential velocity, and tangential acceleration via the derivative! Example: A record player is plugged in and uniformly accelerates to 45 revolutions per minute in 0.85 seconds. Mints are located 3.0 cm, 8.0 cm, and 13.0 cm from the center of the record. What is the magnitude of the tangential acceleration of each mint? Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:21 The tangential acceleration equation 0:55 Translating the example problem 2:13 Solving for angular acceleration 3:02 Solving for tangential accelerations 4:16 Visualizing the tangential accelerations 5:05 Using the derivative to relate arc length, tangential velocity, and tangential acceleration Multilingual? Please help translate Flipping Physics videos! Next Video: Demonstrating the Directions of Tangential Velocity and Acceleration Previous Video: Introductory Tangential Velocity Problem - Mints on a Turntable Please support me on Patreon! Thank you to Christopher Becke and Natasha Trousdale for being my Quality Control Team for this video.
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