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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]

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

Walking is just controlled falling. Don't believe me? Take a step. The human body has its center of mass high up off the ground, so it requires a continuously acting balance system. When you take a single step, you shift your weight forward in such a way that if you didn't have a balancing system, you would fall flat on your face. At the last second, you swing a leg forward and catch yourself, regaining your balance. Taking a walk is just repeating the same motion over and over again. The reason walking is not thought of very often throughout the day is because it is intuitive. It is learned and perfected early on in life, so many humans don't pay much attention to it. Learning to walk on two legs was a major achievement for the human species, and it helped free the hands to create tools and the civilization we live in today, all because we learned to fall and catch ourselves, and then again and again.