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Flipping Physics

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Everything posted by Flipping Physics

  1. Name: A Free-Fall Problem That You Must Split Into Two Parts Category: Kinematics Date Added: 22 May 2014 - 04:27 PM Submitter: Flipping Physics Short Description: None Provided This is a complicated free-fall problem where you have to identify that the velocity at the top of the path is zero in the y-direciton. Furthermore, you have to look at it from the perspective of the whole event and splitting the problem into two different parts. A classic free-fall acceleration example problem. Content Times: 0:45 Reading the problem 1:12 Translating the problem to physics 3:04 Starting with the whole event 4:36 Splitting the problem into two parts 6:06 Solving part 1: Going up 8:17 Finishing the problem 9:05 An alternate solution 9:38 The review View Video
  2. Name: Creating a Position vs. Time Graph using Stop Motion Photography Category: Kinematics Date Added: 22 May 2014 - 04:26 PM Submitter: Flipping Physics Short Description: None Provided We talk about a lot of graphs in the theoretical sense. In this video we are actually going to create a position versus time graph in a real sense. By using stop motion photography and stopping a ball at various intervals while falling, we will create a position as a function of time graph. Content Times: 0:23 Identifying the Position vs. Time graph we are going to create 0:46 A single video slice of free-fall 1:19 Slow the video down to 1/8th speed 1:50 Creating the graph 2:10 Proving that reality matches the graph View Video
  3. Name: The Drop and Upward Throw of a Ball are Very Similar Category: Kinematics Date Added: 22 May 2014 - 04:25 PM Submitter: Flipping Physics Short Description: None Provided Previously we determined the motion graphs for dropping a ball from 2.0 meters and throwing a ball up to 2.0 meters and catching it again. In this video I show that the reverse of the drop coupled with the drop itself is the same thing as throwing the ball upward. Make sense? Okay, watch the video. Content Times: 0:13 Reviewing the previous graphs 0:25 The drop is the same as the 2nd half of the drop 0:48 Dropping the medicine ball in reverse 1:16 Bobby reviews 1:35 Links to Previous and Next Videos View Video
  4. Name: Throwing a Ball up to 2.0 Meters & Proving the Velocity at the Top is Zero Category: Kinematics Date Added: 22 May 2014 - 04:23 PM Submitter: Flipping Physics Short Description: None Provided In the previous lesson we dropped a ball from 2.0 meters above the ground and now we throw one up to a height of 2.0 meters. We do this in order to understand the similarities between the two events. Oh, and of course we draw some graphs. This is an Introductory Free-Fall Acceleration Problem Content Times: 0:18 Reviewing the previous lesson 0:34 Reading the new problem 1:26 Acceleration vs. time 1:59 Velocity vs. time 2:49 Position vs. time 4:16 The Velocity at the top is ZERO! 5:50 Comparing throwing the ball to dropping the ball 6:56 Finding the total change in time 7:44 Finding the velocity initial 9:47 The Review View Video
  5. Name: Graphing the Drop of a Ball from 2.0 Meters - An Introductory Free-Fall Acceleration Problem Category: Kinematics Date Added: 22 May 2014 - 04:22 PM Submitter: Flipping Physics Short Description: None Provided This video continues a problem we already solved involving dropping a ball from 2.0 meters. Now we determine how to draw the position, velocity and acceleration as functions of time graphs. Content Times: 0:17 Reviewing the previous lesson 1:00 Acceleration as a function of time 1:31 Velocity as a function of time 2:39 Position as a function of time 3:56 The Review View Video
  6. Name: Dropping a Ball from 2.0 Meters - An Introductory Free-Fall Acceleration Problem Category: Kinematics Date Added: 22 May 2014 - 04:20 PM Submitter: Flipping Physics Short Description: None Provided In this introductory free-fall acceleration problem we analyze a video of a medicine ball being dropped to determine the final velocity and the time in free-fall. Included are three common mistakes students make. "Why include mistakes?" you might ask. Well, it is important to understand what happens when you make mistakes so that you can recognize them in the future. There is also brief description of "parallax" and how it affects what you see in the video compared to reality. Content TImes: 0:26 Reading and viewing the problem 0:50 Describing the parallax issue 1:52 Translating the problem to physics 2:05 1st common mistake: Velocity final is not zero 3:09 Finding the 3rd UAM variable, initial velocity 3:56 Don't we need to know the mass of the medicine ball? 4:35 Solving for the final velocity in the y direction: part (a) 5:39 Identifying our 2nd common mistake: Square root of a negative number? 7:56 Solving for the change in time: part ( 8:28 Identifying our 3rd common mistake: Negative time? 9:36 Please don't write negative down! 10:27 Does reality match the physics? 11:07 The Review Want Lecture Notes? Next Video: Graphing the Drop of a Ball from 2.0 Meters - An Introductory Free-Fall Acceleration Problem Previous Video: Analyzing the Apollo 15 Feather and Hammer Drop -- A Basic Introductory Free-Fall Problem View Video
  7. Name: Analyzing the Apollo 15 Feather and Hammer Drop - A Basic, Introductory Free-Fall Problem Category: Kinematics Date Added: 21 May 2014 - 03:54 PM Submitter: Flipping Physics Short Description: None Provided Apollo 15 Video Courtesy of NASA: The 1971 Feather and Hammer Drop Experiment performed by Astronaut David Scott. We analyze the experiment to determine the height from which the feather and hammer were dropped. It is a great, basic, introductory free-fall problem. Content Times: 0:19 Why the experiment was done. 0:32 Let's enjoy the video 1:27 Beginning to analyze the video 2:23 Using the Frame Rate 3:00 Counting the frames 3:50 Solving for the initial height 4:51 The answer to how high the feather and hammer were dropped 5:31 The Review View Video
  8. Name: Introduction to Free-Fall and the Acceleration due to Gravity Category: Kinematics Date Added: 21 May 2014 - 03:52 PM Submitter: Flipping Physics Short Description: None Provided In this lesson we extend our knowledge of Uniformly Accelerated Motion to include freely falling objects. We talk about what Free-Fall means, how to work with it and how to identify and object in Free-Fall. Today I get to introduce so many of my favorites: the medicine ball, the vacuum that you can breathe and, of course, little g. Content Times: 0:22 An Example of An Object in Free-Fall 0:54 Textbook definition of a freely falling object 1:11 We have not defined a "Force" so this is how we define Free-Fall 2:07 No Air Resistance (The Vacuum that You Can Breathe!) 3:10 What does it mean to be in Free-Fall? (The Acceleration due to Gravity) 4:41 The Acceleration due to Gravity - Not on Earth 5:24 g is not constant on Earth. Very close, but not quite 5:56 Common Misconception: Objects moving upward can be freely falling 6:35 Free-Fall is Uniformly Accelerated Motion 7:27 What does the negative mean in -9.81 m/s^2? 7:57 Is "g" positive or negative? 9:01 How can "g" be not constant and we can use UAM? 10:03 Does mass effect the acceleration due to gravity? 10:47 The Review View Video
  9. Name: Reviewing One Dimensional Motion with the Table of Friends Category: Kinematics Date Added: 21 May 2014 - 03:51 PM Submitter: Flipping Physics Short Description: None Provided We get to start our Table of Friends today. Dimensions are your friends and there are so many dimensions to keep track of, so we create our Table of Friends to help us keep track of them. Today's friends have to do with One Dimensional Motion. Content Times: 0:35 Naming all 5 friends 1:13 Relative Error 1:40 Displacement 2:01 Speed 2:55 Velocity 3:14 How can we forget Delta? 4:24 Acceleration 4:46 The Review View Video
  10. Name: Graphical UAM Example Problem Category: Kinematics Date Added: 21 May 2014 - 03:48 PM Submitter: Flipping Physics Short Description: None Provided Again with the graphs? Yes. Absolutely Yes. Graphs are such an important part of any science, especially physics. The more you work with graphs, the more you will understand them. Here we combine graphs and uniformly accelerated motion. Enjoy. Content Times: 0:29 Reading the Problem 1:02 How do we know it is UAM from the graph? 1:26 Two different, equivalent equations for acceleration 2:41 Finding acceleration 3:23 Graphing acceleration vs. time 3:44 The general shape of the position vs. time graph 4:53 Determining specific points on the position vs. time graph 6:06 Graphing position vs. time 6:58 The Review View Video
  11. Name: Understanding Instantaneous and Average Velocity using a Graph Category: Kinematics Date Added: 21 May 2014 - 03:47 PM Submitter: Flipping Physics Short Description: None Provided Students often get confused by the difference between Instantaneous and Average. In this video we use a graph to compare and understand the two different concepts. Content Times: 0:28 Defining Instantaneous and Average Velocity 0:52 Examples of Each 2:23 The Graph 2:42 Walking the Graph (my favorite part) 3:19 Average Velocity from 0 - 5 Seconds 5:30 Average Velocity from 5 - 10 Seconds 6:45 Some Instantaneous Velocities 7:44 Average Velocity from 0 - 17 Seconds 8:37 Drawing this Average Velocity on the Graph 9:15 Comparing Average Velocity to Instantaneous Velocity 10:32 What was the Instantaneous Velocity at exactly 5 seconds? 11:47 The Review View Video
  12. Name: Toy Car UAM Problem with Two Difference Accelerations Category: Kinematics Date Added: 21 May 2014 - 03:45 PM Submitter: Flipping Physics Short Description: None Provided In this lesson we continue to use what we have learned about solving Uniformly Accelerated Motion (UAM) problems. This problem is more complicated because it involves two, interconnected parts. Content Times: 0:26 Reading the problem 0:46 Seeing the problem 1:11 Translating from words to physics 1:58 Splitting the problem into two parts 3:13 Fixing the knowns (common mistakes) 4:35 How do we know we can use the UAM equations? 5:19 Drawing a picture to better understand the problem 6:00 Finding the missing known 7:29 What are we finding again? 8:45 The end of part 1 is the start of part 2! 9:29 Beginning to solve the problem 11:19 Solving part ( 13:53 What is wrong with solving the whole thing at once? 16:03 Rapping it up! Want Lecture Notes? Next Video: The Humility Soapbox -- Uniformly vs. Uniformally Previous Video: Introductory Uniformly Accelerated Motion Problem -- A Braking Bicycle View Video
  13. Name: Introductory Uniformly Accelerated Motion Problem - A Braking Bicycle Category: Kinematics Date Added: 21 May 2014 - 03:43 PM Submitter: Flipping Physics Short Description: None Provided This video continues what we learned about UAM in our previous lesson. We work through a introductory problem involving a bicycle on which we have applied the brakes. Content Times: 0:28 Reading the problem 0:48 Seeing the problem 1:15 Translating the problem to physics 2:35 Why is it final speed and not velocity? 3:48 Solving for the acceleration 6:03 Converting initial velocity to meters per second 7:32 Solving for distance traveled. 8:05 A common mistake 10:02 Two more ways to solve for the distance traveled. 10:45 Why didn't the speedometer show the correct final speed? View Video
  14. Name: Introduction to Uniformly Accelerated Motion with Examples of Objects in UAM Category: Kinematics Date Added: 21 May 2014 - 03:42 PM Submitter: Flipping Physics Short Description: None Provided This is an introductory lesson about Uniformly Accelerated Motion or UAM. I show examples of 5 different objects experiencing UAM, some are even in slow motion. We also learn my simple way of remembering how to use the UAM equations. Content Times: 0:20 Defining what it means to be in UAM 0:40 5 examples of objects experiencing UAM (some in slow motion) 1:50 Disclaimer for the peanut gallery 2:50 The four UAM equations 3:32 The five UAM variables 4:45 How to work with the UAM equations 5:31 One Happy Physics Student! View Video
  15. Name: Walking Position, Velocity and Acceleration as a Function of Time Graphs Category: Kinematics Date Added: 21 May 2014 - 08:56 AM Submitter: Flipping Physics Short Description: None Provided This lesson builds on what we learned about position as a function of time graphs. We start with velocity as a function of time graphs, determine what the motion would look like and then draw position and acceleration as a function of time graphs. We use the concepts of slope and tangent line to help us build the graphs. Content Times: 0:35 What is the slope of a velocity vs. time graph? 2:30 Walking the 1st velocity vs. time example 4:17 Explaining what a constant slope is 7:11 Drawing position vs. time for the 1st example 9:08 The Magic Tangent Line Finder! (defining tangent line) 11:18 A look forward to Calculus 12:51 Drawing acceleration vs. time for the 1st example 14:35 Walking the 2nd velocity vs. time example 15:47 Drawing position vs. time for the 2nd example 17:19 Drawing acceleration vs. time for the 2nd example 18:17 Walking the 3rd velocity vs. time example 20:41 Drawing position and acceleration vs. time for the 3rd example 22:55 Ideal vs. real data View Video
  16. Name: A Basic Acceleration Example Problem and Understanding Acceleration Direction Category: Kinematics Date Added: 21 May 2014 - 08:53 AM Submitter: Flipping Physics Short Description: None Provided This video starts with a simple acceleration problem and then addresses a commonly held misconception that a negative acceleration always means you are slowing down. I do this by way of examples. Kate (my wife) drove the Prius with a camera suction cupped to the window and videoed me riding my bike several times. In the end I ended up with four different examples on the screen at once and 25 different video layers to describe it all. I am really proud about how well it worked. Enjoy. Content Times: 0:26 Reading the problem 0:40 Seeing the problem 1:14 Translating the words to Physics 1:54 Solving the problem 3:50 Why is the number on the bike positive? 4:48 How can the bike be speeding up if the acceleration is negative? 5:50 Comparing velocity and acceleration directions 7:28 All four bike examples on the screen at the same time 7:53 Why isn't there a direction on our answer? 8:51 Outtakes or how the bike riding was filmed View Video
  17. Name: Introduction to Acceleration with Prius Brake Slamming Example Problem Category: Kinematics Date Added: 21 May 2014 - 08:52 AM Submitter: Flipping Physics Short Description: None Provided This is an introduction to the concept of acceleration. There is also an example problem showing applying the brakes while driving a car in order to avoid hitting a basketball. Also included are common mistakes students make while solving a simple problem like this. It is important to see what those mistakes are because it helps students avoid them in the future. Content Times: 0:19 The Equation for Acceleration 1:06 The Dimensions for Acceleration 2:18 Acceleration has both Magnitude and Direction 3:00 Reading the Problem 3:15 Video of the Problem 4:29 Translating the Problem to Physics 5:03 Starting to solve the Problem (with mistakes) 5:37 Explaining two mistakes 7:34 Explaining another mistake 10:00 Outtakes (including a basketball dribbling montage) View Video
  18. Name: Finding Average Speed for Pole Position: Example Problem - Not as easy as you may think Category: Kinematics Date Added: 21 May 2014 - 08:50 AM Submitter: Flipping Physics Short Description: None Provided This video is an example problem that walks through finding the average speed for the last 2 laps of the 4 lap qualifier for the Indianapolis 500 assuming an average speed for the first 2 laps. It is actually more difficult than it initially appears. Content Times: 0:36 Reading the Problem 1:06 Translating to Physics 3:25 A Visual representation of our Known Values 4:07 Beginning to Solve the Problem 5:27 Finding the Time for Part 1 7:15 Finding the Total Time 9:00 Finding the Time for Part 2 10:15 Finding the Average Speed for Part 2 10:45 A Common Mistake 12:07 The Answer 13:15 A Question about Significant Digits View Video
  19. Name: Understanding and Walking Position as a function of Time Graphs Category: Kinematics Date Added: 21 May 2014 - 08:48 AM Submitter: Flipping Physics Short Description: None Provided In this lesson we derive that the slope of a position versus time graph is velocity. We also walk through several position as a function of time graphs to understand what they mean. Content Times: 0:34 Position as a function of Time 1:04 Defining Slope 3:04 The Slope of a Position as a function of Time Graph is Velocity 3:43 Defining Position Locations on the Graph 4:37 1st Graph 6:25 2nd Graph 7:25 3rd Graph 9:18 4th Graph View Video
  20. Name: Velocity and Speed are Different: Example Problem Category: Kinematics Date Added: 21 May 2014 - 08:47 AM Submitter: Flipping Physics Short Description: None Provided This example problem works shows that Velocity and Speed are different. It also illustrates that Speed is Not Velocity without direction. Content Times: 0:16 Reading the Problem 1:10 Translating the problem to physics 1:53 Part (a) Average Speed 2:57 Part ( Average Velocity 4:34 Speed is Not Velocity without direction Want Lecture Notes? Next Video: Understanding and Walking Position as a function of Time Graphs Previous Video: Average Velocity Example Problem with Three Velocities View Video
  21. Name: Average Velocity Example Problem with Three Velocities Category: Kinematics Date Added: 21 May 2014 - 08:45 AM Submitter: Flipping Physics Short Description: None Provided This example problem works through finding the average velocity when we have multiple parts to the givens. It involves splitting the given information into separate parts, finding the total displacement, the total time and then the total average velocity. Content Times: 0:23 Reading the Problem 0:56 Translating the problem to physics 1:47 Splitting the givens into three parts 3:58 A plea to slow down when solving problems 5:13 Putting the givens in to a table 5:53 Beginning to solve the problem 6:59 Solving for the individual displacements 8:39 Finding the total displacement 9:33 Finding the total average velocity 10:58 A incorrect way to solve for average velocity 12:20 Outtakes View Video
  22. Name: Introduction to Velocity and Speed and the differences between the two. Category: Kinematics Date Added: 21 May 2014 - 08:44 AM Submitter: Flipping Physics Short Description: None Provided This video introduces the definition of Velocity. It also walks through a simple, introductory average velocity example problem. At the end it defines speed and discusses the difference between speed and velocity. Content Times: (click to skip to that time) 0:18 Velocity Definition 2:12 Velocity has both Magnitude and Direction 3:06 Example Problem 8:41 Speed Definition 9:15 Differences between Speed and Velocity 11:00 Outtakes View Video
  23. Name: Introduction to Displacement and the Difference between Displacement and Distance Category: Kinematics Date Added: 21 May 2014 - 08:43 AM Submitter: Flipping Physics Short Description: None Provided An introduction to Displacement including many different descriptions of displacement. This video also describes the differences between displacement and distance. There are also three different examples illustrating those differences. Times of Content: 0:23 First description of displacement 1:13 The symbol for displacement 2:32 The equation for displacement 3:28 Dimensions for displacement 4:16 Defining magnitude 4:50 Displacement does not equal distance 5:34 Defining Directions (up does not equal North) 7:35 1st Example 8:28 2nd Example 9:27 3rd Example (my personal favorite) View Video
  24. Name: A Problem to Review SOH CAH TOA and the Pythagorean Theorem for use in Physics Category: Introductory Concepts Date Added: 20 May 2014 - 01:45 PM Submitter: Flipping Physics Short Description: None Provided This video goes through a right triangle problem, finding the length of two sides and an angle. It is a basic review of SOH CAH TOA and the Pythagorean Theorem; very fundamental items in Physics. Times of Content: 0:35 Defining a Right Triangle 1:09 Defining the problem 2:12 Defining SOH CAH TOA 4:02 Defining Opposite and Adjacent 5:04 Step 1) Finding the Hypotenuse 7:12 Step 2) Finding Side y 9:19 Step 3) Finding Theta 2 View Video
  25. Name: Introduction to Accuracy and Precision (includes Relative Error) Category: Introductory Concepts Date Added: 20 May 2014 - 01:44 PM Submitter: Flipping Physics Short Description: None Provided This video includes the definitions of Accuracy and Precision. It also shows several examples using a "Safe Dart" bow and arrow. It ends with the equation for Relative Error. Times of Content: 0:44 Definition of Accuracy 1:39 Definition of Precision 2:17 The Question for all the Examples 3:48 1st Example 4:31 2nd Example 5:14 3rd Example 6:33 4th Example 7:32 Relative Error Equation 9:37 "Safe Dart" Outtakes (it took forever to get the "Safe Dart" to work) View Video
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