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Yes, there are mistakes that many people make when it comes to free-fall acceleration problems. I dispel many misconceptions and explain both why people think they are true and why they actually aren't. Oh, and there are some special effects too! Content Times: 0:14 Review of the Basics of Free-Fall 1:04 1st Misconception - The acceleration on the way up is positive 2:09 2nd Misconception - The initial velocity going upward is zero 2:45 3rd Misconception - A thrown ball will accelerate faster than a dropped ball 4:00 Reminder - Velocity at the top is zero 4:29 4th Misconception - The acceleration at the top is zero 6:36 Review [url="http://www.flippingphysics.com/common-free-fall-pitfalls.html"]Want Lecture Notes?[/url] Previous Video: [url="http://www.flippingphysics.com/stop-motion-photography.html"]Creating a Position vs. Time Graph using Stop Motion Photography[/url] Next Video: [url="http://www.flippingphysics.com/free-fall-problem.html"]A Free-Fall Problem That You Must Split Into Two Parts[/url]
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Name: Common Free-Fall Pitfalls Category: Kinematics Date Added: 22 May 2014 - 04:32 PM Submitter: Flipping Physics Short Description: None Provided Yes, there are mistakes that many people make when it comes to free-fall acceleration problems. I dispel many misconceptions and explain both why people think they are true and why they actually aren't. Oh, and there are some special effects too! Content Times: 0:14 Review of the Basics of Free-Fall 1:04 1st Misconception - The acceleration on the way up is positive 2:09 2nd Misconception - The initial velocity going upward is zero 2:45 3rd Misconception - A thrown ball will accelerate faster than a dropped ball 4:00 Reminder - Velocity at the top is zero 4:29 4th Misconception - The acceleration at the top is zero 6:36 Review View Video
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An advanced free-fall acceleration problem involving 2 parts and 2 objects. Problem: You are wearing your rocket pack (total mass = 75 kg) that accelerates you upward at a constant 10.5 m/s^2. While preparing to take pictures of the beautiful view, you drop your camera 5.0 seconds after liftoff. 5.0 seconds after you drop the camera, (a) what is the camera's velocity and (b) how far are you from the camera? Content Times: 0:17 Reading the problem 1:26 Understanding the problem using a picture 2:10 Listing every known variable 3:22 Which part do we start solving first? 3:47 What do we solve for in part 1? 4:46 That's a lot of subscripts, why? 5:24 Starting to solve the problem. Finding the final velocity for part 1. 6:32 Solving for the final velocity for part 2 for the camera 7:46 Why is the final velocity for part 2 for the camera positive? 9:10 Finding the displacement for part 2 for the camera 9:55 Finding the displacement for part 2 for you 10:42 Finding the distance between you and the camera at the very end 11:27 The Review [url="http://www.flippingphysics.com/dont-drop-your-camera.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/vectors-and-scalars.html"]Introduction to Tip-to-Tail Vector Addition, Vectors and Scalars[/url] Previous Video: [url="http://www.flippingphysics.com/dropping-dictionaries.html"]Dropping Dictionaries Doesn't Defy Gravity, Duh![/url]
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Name: Don't Drop Your Camera 5.0 Seconds After Liftoff Category: Kinematics Date Added: 22 May 2014 - 04:31 PM Submitter: Flipping Physics Short Description: None Provided An advanced free-fall acceleration problem involving 2 parts and 2 objects. Problem: You are wearing your rocket pack (total mass = 75 kg) that accelerates you upward at a constant 10.5 m/s^2. While preparing to take pictures of the beautiful view, you drop your camera 5.0 seconds after liftoff. 5.0 seconds after you drop the camera, (a) what is the camera's velocity and ( how far are you from the camera? Content Times: 0:17 Reading the problem 1:26 Understanding the problem using a picture 2:10 Listing every known variable 3:22 Which part do we start solving first? 3:47 What do we solve for in part 1? 4:46 That's a lot of subscripts, why? 5:24 Starting to solve the problem. Finding the final velocity for part 1. 6:32 Solving for the final velocity for part 2 for the camera 7:46 Why is the final velocity for part 2 for the camera positive? 9:10 Finding the displacement for part 2 for the camera 9:55 Finding the displacement for part 2 for you 10:42 Finding the distance between you and the camera at the very end 11:27 The Review Want Lecture Notes? Next Video: Introduction to Tip-to-Tail Vector Addition, Vectors and Scalars Previous Video: Dropping Dictionaries Doesn't Defy Gravity, Duh! View Video -
Video Proof of the Mass Independence of the Acceleration due to Gravity and a little dancing. Content Times: 0:14 Reviewing the mass independence of free-fall acceleration. 0:56 1 book 1:36 What's a boom box? 2:07 All 4 videos together 2:31 We can dance if we want to 3:25 Thank you very much for learning with me today [url="http://www.flippingphysics.com/dropping-dictionaries.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/dont-drop-your-camera.html"]Don't Drop Your Camera 5.0 Seconds After Liftoff[/url] Previous Video: [url="http://www.flippingphysics.com/free-fall-problem.html"]A Free-Fall Problem That You Must Split Into Two Parts[/url] Picture Permissions: Boom Box - By Jmpicot (Own work) [CC-BY-SA-3.0 ([url="http://creativecommons.org/licenses/by-sa/3.0"]http://creativecommons.org/licenses/by-sa/3.0[/url])], via Wikimedia Commons
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Name: Dropping Dictionaries Doesn't Defy Gravity, Duh! Category: Kinematics Date Added: 22 May 2014 - 04:29 PM Submitter: Flipping Physics Short Description: None Provided Video Proof of the Mass Independence of the Acceleration due to Gravity and a little dancing. Content Times: 0:14 Reviewing the mass independence of free-fall acceleration. 0:56 1 book 1:36 What's a boom box? 2:07 All 4 videos together 2:31 We can dance if we want to 3:25 Thank you very much for learning with me today View Video
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A Free-Fall Problem That You Must Split Into Two Parts
Flipping Physics posted a video in Kinematics
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 [url="http://www.flippingphysics.com/free-fall-problem.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/dropping-dictionaries.html"]Dropping Dictionaries Doesn't Defy Gravity, Duh![/url] Previous Video: [url="http://www.flippingphysics.com/common-free-fall-pitfalls.html"]Common Free-Fall Pitfalls[/url] -
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
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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 [url="http://www.flippingphysics.com/stop-motion-photography.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/common-free-fall-pitfalls.html"]Common Free-Fall Pitfalls[/url] Previous Video: [url="http://www.flippingphysics.com/drop-and-upward-throw.html"]The Drop and Upward Throw of a Ball are Very Similar[/url]
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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
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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 [url="http://www.flippingphysics.com/drop-and-upward-throw.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/stop-motion-photography.html"]Creating a Position vs. Time Graph using Stop Motion Photography[/url] Previous Video: [url="http://www.flippingphysics.com/throwing-a-ball.html"]Throwing a Ball up to 2.0 Meters & Proving the Velocity at the Top is Zero[/url]
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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
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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 [url="http://www.flippingphysics.com/throwing-a-ball.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/drop-and-upward-throw.html"]The Drop and Upward Throw of a Ball are Very Similar[/url] Previous Video: [url="http://www.flippingphysics.com/graphing-the-drop-of-a-ball.html"]Graphing the Drop of a Ball from 2.0 Meters[/url] - An Introductory Free-Fall Acceleration Problem
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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
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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 [url="http://www.flippingphysics.com/graphing-the-drop-of-a-ball.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/throwing-a-ball.html"]Throwing a Ball up to 2.0 Meters & Proving the Velocity at the Top is Zero[/url] Previous Video: [url="http://www.flippingphysics.com/dropping-a-ball-from-20-meters.html"]Dropping a Ball from 2.0 Meters[/url] - An Introductory Free-Fall Acceleration Problem
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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
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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 (b) 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 [url="http://www.flippingphysics.com/dropping-a-ball-from-20-meters.html"]Want Lecture Notes?[/url] Next Video: [url="http://www.flippingphysics.com/graphing-the-drop-of-a-ball.html"]Graphing the Drop of a Ball from 2.0 Meters[/url] - An Introductory Free-Fall Acceleration Problem Previous Video: [url="http://www.flippingphysics.com/apollo-15-feather-and-hammer-drop.html"]Analyzing the Apollo 15 Feather and Hammer Drop[/url] -- A Basic Introductory Free-Fall Problem
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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
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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 [url="http://www.flippingphysics.com/apollo-15-feather-and-hammer-drop.html"]Want Lecture Notes?[/url] Previous Video: [url="http://www.flippingphysics.com/introduction-to-free-fall.html"]Introduction to Free-Fall and the Acceleration due to Gravity[/url] Next Video: [url="http://www.flippingphysics.com/dropping-a-ball-from-20-meters.html"]Dropping a Ball from 2.0 Meters - An Introductory Free-Fall Acceleration Problem[/url] Permissions: Picture of Moon: By Jmpicot (Own work) [CC-BY-SA-3.0 ([url="http://creativecommons.org/licenses/by-sa/3.0"]http://creativecommons.org/licenses/by-sa/3.0[/url])], via Wikimedia Commons Picture of Astronaut David Scott and Apollo 15 video: This file is in the public domain because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted".
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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
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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 [url="http://www.flippingphysics.com/introduction-to-free-fall.html"]Want Lecture Notes?[/url] Previous Video: [url="http://www.flippingphysics.com/reviewing-one-dimensional-motion.html"]Reviewing One Dimensional Motion with the Table of Friends[/url] Next Video: [url="http://www.flippingphysics.com/apollo-15-feather-and-hammer-drop.html"]Apollo 15 Feather and Hammer Drop[/url]
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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