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Name: Impulse for Two Objects being Attracted to One Another Category: Circular Motion & Gravity Date Added: 20180311 Submitter: Flipping Physics In a universe devoid of anything else, two identical spheres of mass, m, and radius, R, are released from rest when they have a distance between their centers of mass of X. Find the magnitude of the impulse delivered to each sphere until just before they make contact. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:07 Translating the problem 1:26 Applicable impulse equations 2:13 Conservation of mechanical energy 3:28 Showing a common mistake 4:00 Solving the problem Next Video: Force of Gravity and Gravitational Potential Energy Functions from Zero to Infinity (but not beyond) Multilingual? Please help translate Flipping Physics videos! Previous Video: Mechanical Energy of a Satellite in Circular Orbit Please support me on Patreon! Thank you to Aarti Sangwan, Sawdog, Jonathan Everett, Christopher Becke, and Scott Carter for being my Quality Control Team for this video. Thank you to Youssef Nasr for transcribing the English subtitles of this video. Impulse for Two Objects being Attracted to One Another

 universal gravitational potential energy
 kinetic energy
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Name: AP Physics C: Rotational vs. Linear Review (Mechanics) Category: Rotational Motion Date Added: 20170428 Submitter: Flipping Physics Calculus based review and comparison of the linear and rotational equations which are in the AP Physics C mechanics curriculum. Topics include: displacement, velocity, acceleration, uniformly accelerated motion, uniformly angularly accelerated motion, mass, momentum of inertia, kinetic energy, Newton’s second law, force, torque, power, and momentum. Want Lecture Notes? Content Times: 0:12 Displacement 038 Velocity 1:08 Acceleration 1:33 Uniformly Accelerated Motion 2:15 Uniformly Angularly Accelerated Motion 2:34 Mass 3:19 Kinetic Energy 3:44 Newton’s Second Law 4:18 Force and Torque 5:12 Power 5:45 Momentum Multilingual? Please help translate Flipping Physics videos! AP Physics C Review Website Next Video: AP Physics C: Universal Gravitation Review (Mechanics) Previous Video: AP Physics C: Rotational Dynamics Review  2 of 2 (Mechanics) Please support me on Patreon! Thank you to Sawdog for being my Quality Control individual for this video. AP Physics C: Rotational vs. Linear Review (Mechanics)

Name: AP Physics C: Work, Energy, and Power Review (Mechanics) Category: Work Energy & Power Date Added: 20170330 Submitter: Flipping Physics Calculus based review of work done by constant and nonconstant forces, Hooke’s Law, Work and Energy equations in isolated and nonisolated systems, kinetic energy, gravitational potential energy, elastic potential energy, conservative vs. nonconservative forces, conservation of mechanical energy, power, neutral, stable, and unstable equilibrium. For the calculus based AP Physics C mechanics exam. Want Lecture Notes? Content Times: 0:11 Work done by a constant force 2:25 Work done by a nonconstant force 3:58 Force of a Spring (Hooke’s Law) 4:52 Calculating the work done by the force of a spring 6:26 Net work equals change in kinetic energy 7:02 Gravitational Potential Energy 7:50 Nonisolated systems work and energy 8:29 Isolated systems work and energy 9:02 Conservative vs. Nonconservative forces 10:10 Conservation of Mechanical Energy 10:45 Power 12:09 Every derivative can be an integral 13:00 Conservative forces and potential energy 13:46 Deriving Hooke’s Law from elastic potential energy 14:22 Deriving the force of gravity from gravitational potential energy 15:17 Neutral, stable, and unstable equilibrium Multilingual? Please help translate Flipping Physics videos! AP Physics C Review Website Next Video: AP Physics C: Integrals in Kinematics Review (Mechanics) Previous Video: AP Physics C: Dynamics Review (Mechanics) Please support me on Patreon! Thank you to Aarti Sangwan for being my Quality Control help. AP Physics C: Work, Energy, and Power Review (Mechanics)

 unstable equilibrium
 stable equilibrium

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 unstable equilibrium
 stable equilibrium
 work
 neutral equilibrium
 constant force
 nonconstant force
 hookes law
 net work
 spring
 kinetic energy
 gravitational potential energy
 elastic potential energy
 isolated system
 potential energy
 nonisolated system
 conservative force
 nonconservative force
 conservation of energy
 power

Name: 2D Conservation of Momentum Example using Air Hockey Discs Category: Momentum and Collisions Date Added: 20170521 Submitter: Flipping Physics A 28.8 g yellow air hockey disc elastically strikes a 26.9 g stationary red air hockey disc. If the velocity of the yellow disc before the collision is 33.6 cm/s in the x direction and after the collision it is 10.7 cm/s at an angle 63.4° S of E, what is the velocity of the red disc after the collision? This is an AP Physics 1 topic. Want Lecture Notes? Content Times: 0:12 The problem 1:49 Breaking the initial velocity of disc 1 into its components 3:06 Conservation of momentum in the xdirection 5:24 Conservation of momentum in the ydirection 6:26 Solving for the final velocity of disc 2 using its components 8:40 Was this an elastic collision? 12:39 Movie Character Day! Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to Circular Motion and Arc Length Previous Video: Review of Mechanical Energy and Momentum Equations and When To Use Them! Please support me on Patreon! Thank you to my Quality Control help: Christopher Becke, Scott Carter and Jennifer Larsen "Nombre de los vientos". Licensed under Public domain via Wikimedia Commons  2D Conservation of Momentum Example using Air Hockey Discs

 kinetic energy
 elastic

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Name: Introductory Elastic Collision Problem Demonstration Category: Momentum and Collisions Date Added: 20161124 Submitter: Flipping Physics An elastic collision is demonstrated and analyzed. Want lecture notes? This is an AP Physics 1 Topic. A big thank you to Mr. Becke for being a guest in today’s video! Content Times: 0:25 Reading and translating the problem 1:17 The demonstration 1:52 Solving for velocity final of cart 2 3:46 Measuring the velocity final of cart 2 4:25 Checking if kinetic energy is conserved 6:22 We should have converted to meters per second Next Video: Demonstrating Impulse is Area Under the Curve Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Perfectly Inelastic Collision Problem Demonstration Please support me on Patreon! Thank you to my Quality Control help: Christopher Becke and Jennifer Larsen Introductory Elastic Collision Problem Demonstration

Name: Introduction to Elastic and Inelastic Collisions Category: Momentum and Collisions Date Added: 20161110 Submitter: Flipping Physics Learn about Elastic, Inelastic and Perfectly Inelastic collisions via a demonstration Want lecture notes? This is an AP Physics 1 Topic. Content Times: 0:15 The charities 1:05 Elastic collisions 2:09 Inelastic collisions 3:29 Perfectly Inelastic collisions 4:13 Demonstration #1 5:28 Demonstration #2 Next Video: Introductory Perfectly Inelastic Collision Problem Demonstration Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Conservation of Momentum Explosion Problem Demonstration The Charities: Children With Hair Loss Alpha House Home Of New Vision American Foundation for Suicide Prevention Please support me on Patreon! Introduction to Elastic and Inelastic Collisions

 inelastic
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Name: Free Response Question #3  AP Physics 1  2015 Exam Solutions Category: Exam Prep Date Added: 20160331 Submitter: Flipping Physics Want Lecture Notes? Content Times: 0:11 The initial setup 1:00 Part (a) setup 2:11 Part (a) at x = D 3:07 Part (a) from x = D to x = 0 4:28 Part (a) from x = 0 to x = 3D 6:39 Part (b) 7:21 Part (b i) 7:50 Part (b ii) 8:33 Part (c) 10:14 Part (d) Question 11:12 Part (d) Answers AP Physics 1 Review Videos Next Video: Free Response Question #4  AP Physics 1  2015 Exam Solutions Previous Video: Free Response Question #2  AP Physics 1  2015 Exam Solutions Multilingual? Please help translate Flipping Physics videos! 1¢/minute AP® is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product. Link to The 2015 AP Physics 1 Free Response Questions Free Response Question #3  AP Physics 1  2015 Exam Solutions

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 free repsonse question
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Name: WorkEnergy Theorem Problem by Billy Category: Work, Energy, Power Date Added: 20160518 Submitter: Flipping Physics Learn with Billy as he uses the WorkEnergy Theorem or what I prefer to call the Net WorkKinetic Energy Theorem to solve a problem. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:36 The problem statement 1:02 The Net WorkKinetic Energy Theorem 2:03 The Net Work on the Horizontal Surface 3:39 The Net Work on the Incline 4:05 The Work done by the Force of Gravity 5:40 The Work done by the Force of Kinetic Friction 7:24 Substituting back into the Net Work equation 9:31 Positive vs. Negative Work 10:56 A generally overview of what happens to all the energies 11:57 Energy percentages Need help understanding theta 1? Next Video: Introduction to Power Multilingual? Please help translate Flipping Physics videos! Previous Video: Deriving the WorkEnergy Theorem using Calculus 1¢/minute WorkEnergy Theorem Problem by Billy

Name: Deriving the WorkEnergy Theorem using Calculus Category: Work, Energy, Power Date Added: 20160226 Submitter: Flipping Physics Use the integral and derivative to derive the WorkEnergy Theorem or what I prefer to call the Net WorkKinetic Energy Theorem. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:21 The integral definition of work 1:02 Net Work 1:53 Substituting in for acceleration 2:40 Dealing with dv/dt 3:26 Changing the limits 3:50 Substituting in velocity 4:32 Taking the integral 4:56 Kinetic Energy! 5:16 The Theorem 5:42 Other energy equations 6:46 When can we use this equation? Next Video: WorkEnergy Theorem Problem by Billy Multilingual? Please help translate Flipping Physics videos! Previous Video: Work due to Friction equals Change in Mechanical Energy Problem by Billy 1¢/minute Deriving the WorkEnergy Theorem using Calculus

 net work
 kinetic energy

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Name: Introductory Conservation of Mechanical Energy Problem using a Trebuchet Category: Work, Energy, Power Date Added: 20160112 Submitter: Flipping Physics Learn how to use the Conservation of Mechanical Energy equation by solving a trebuchet problem. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:08 The problem 1:08 Why mechanical energy is conserved 1:37 Setting the zero line and initial and final points 2:32 The three types of mechanical energy 3:55 Canceling mechanical energies from the equation 4:54 Solving the equation 6:18 It’s final speed not final velocity 6:51 Why we can’t use the projectile motion equations 7:43 Do we really have to write all that down? Yes. Thank you to my students Will, Jacob, Natalie and Mery; my students who built and let me use their trebuchet! Next Video: Conservation of Energy Problem with Friction, an Incline and a Spring by Billy Multilingual? Please help translate Flipping Physics videos! Previous Video: Introduction to Elastic Potential Energy with Examples 1¢/minute Introductory Conservation of Mechanical Energy Problem using a Trebuchet

 introductory
 conservation
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Name: Introduction to Conservation of Mechanical Energy with Demonstrations Category: Work, Energy, Power Date Added: 20151218 Submitter: Flipping Physics Ian Terry, winner of Big Brother 14, makes a special appearance to help us learn about Conservation of Mechanical Energy. See several demonstrations and understand when mechanical energy is conserved. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:01 Reviewing the three different types of mechanical energy 0:23 Mr. Terry drops an object for our first demonstration 0:58 Calculating Kinetic Energy and Gravitational Potential Energy 2:53 Mechanical energy data table 3:37 Conservation of mechanical energy graph 5:10 When is mechanical energy conserved? 7:13 A second demonstration of conservation of mechanical energy Next Video: Introduction to Conservation of Mechanical Energy with Demonstrations Multilingual? Please help translate Flipping Physics videos! Previous Video: Introduction to Elastic Potential Energy with Examples 1¢/minute Introduction to Conservation of Mechanical Energy with Demonstrations

 demonstration
 conservation
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Name: Introduction to Kinetic Energy with Example Problem Category: Work Energy & Power Date Added: 20151119 Submitter: FizziksGuy Published on Nov 18, 2015 Mr.p rides a bike and drives a car to help you learn about Kinetic Energy. Want Lecture Notes? http://www.flippingphysics.com/introke.html This is an AP Physics 1 topic. Content Times: 0:05 Defining Kinetic Energy 0:36 Joules, the units for Kinetic Energy 1:27 Can Kinetic Energy be negative? 1:54 Defining the example problem 3:01 A common mistake 3:35 Actually solving the problem 4:57 Visualizing the answer Multilingual? Please help translate Flipping Physics videos! http://www.flippingphysics.com/translate.html Previous Video: Introductory Work Problem http://www.flippingphysics.com/workproblem.html 1¢/minute: http://www.flippingphysics.com/give.html Introduction to Kinetic Energy with Example Problem

Why humans are the best distance runners
running_dry posted a blog entry in Tired and a little dehydrated
In my last post I highlighted some of the incredible things that distance runners are able to do, including very long runs at altitude (lower oxygen) and in extreme conditions. But what allows these people to do these kinds of things? The short answer is training. With enough training almost anyone (for the most part excluding the very elderly) could finish an ultra marathon. But why is this? The answer lies in the fact that humans are better adapted to run for long distances than any other animal on the planet. First of all, humans are bipedal meaning that we move around on two feet, and while other primates are able to walk with two limbs humans are the only primates who walk exclusively with only two legs. Bipedalism in itself isn't incredibly unique as other mammals such as macropods (kangaroos, wallabies...) and large birds like ostriches and emus rely on bipedal movement as well, however humans have other adaptations to make bipedalism more efficient. You may not realize it but the human foot is a very intricate mechanical structure containing 26 bones, 33 joints and over 100 muscles and tendons. While running the foot, specifically the arch, acts as a spring which absorbs and returns force to the ground which is done as follows: the foot lands on the outside of the forefoot and pronates inward, stretching muscles which absorb and store force. The foot rocks forward while it pronates so that by the time the front pad of the foot is flat on the ground the toes are pushing off the ground with the energy stored in the foot's muscles. In addition to the feet the rest of the muscles act as springs which store energy from the foot strike to be used as propulsion for that step. As a result, running is basically a process of converting kinetic energy (foot strike) into potential energy (stretched muscles) and back into kinetic energy (push off). Of course as in any system, energy is lost as heat thus cells must break down glucose during anaerobic and aerobic respiration to create ATP for your muscles to use to create additional energy to put into the ground.
 kangaroos
 kinetic energy

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Objective: Moment of Inertia by Inquiry Description: Students experimentally determine the moment of inertia of six different objects (2 solid spheres, 2 solid discs, and 2 rings) by rolling them down a ramp. They then compare their experimentally determined values to the theoretical values which they calculate themselves. Equipment: 2 solid spheres 2 solid discs 2 rings (note that these items can be purchased as a group set through lab supply vendors, or you may create your own) stopwatch meter stick protractor string Procedure: Students develop their own procedures for this lab. Note that the students can take one of two paths to determining the moment of inertia of the rolling objects... both result in the same values if derived carefully, and each is a good reinforcement of key concepts students have been studying up to this point in the class.Free 1 review

 moment of inertia
 rotation

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