APlusPhysics Forumshttp://aplusphysics.com/community/index.php?/discover/13/APlusPhysics Community - APlusPhysics ForumsenWhich Will Be First? (Rolling Down an Incline)http://aplusphysics.com/community/index.php?/videos/view-1065-which-will-be-first-rolling-down-an-incline/A hollow sphere, solid sphere, and thin hoop are simultaneously released from rest at the top of an #incline. Which will reach the bottom first? Assume all objects are of uniform density. #RollingWithoutSlipping Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:12 The problem
0:46 #ConservationOfEnergy
2:22 General solution
3:55 The order of the objects
5:20 The demonstration
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Previous Video: Rolling Acceleration Down an Incline
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Thank you to Christopher Becke and Jonathan Everett for being my Quality Control Team for this video.Sun, 17 Mar 2019 23:05:21 +0000Rolling Acceleration Down an Inclinehttp://aplusphysics.com/community/index.php?/videos/view-1064-rolling-acceleration-down-an-incline/Example: Determine the #Acceleration of a uniform, solid cylinder #RollingWithoutSlipping down an #Incline with incline angle θ. The rotational inertia of a uniform, solid cylinder about its long cylindrical axis is ½MR^2. Assume the cylinder starts from rest. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 The problem
0:43 #ConservationOfEnergy
2:32 Rolling without Slipping
3:32 Displacement and height
5:12 Understanding our solution
6:16 Demonstrating our answer
Next Video: Which Will Be First? (Rolling Down an Incline)
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Previous Video: Rolling Without Slipping Introduction and Demonstrations
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Thank you to Christopher Becke and Jonathan Everett for being my Quality Control Team for this video.Sun, 10 Mar 2019 19:32:02 +0000Rolling Without Slipping Introduction and Demonstrationshttp://aplusphysics.com/community/index.php?/videos/view-1063-rolling-without-slipping-introduction-and-demonstrations/Rolling without Slipping is demonstrated and the equation for velocity of the center of mass is derived. A cycloid is demonstrated. Kinetic energy, distance, and acceleration of rolling without slipping is discussed. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:06 #RollingWithoutSlipping
0:28 #Cycloid
1:15 Translation and Rotational
3:13 Center of Mass Velocity
4:10 Resultant Velocity
4:37 Kinetic Energy
4:58 Distance and Acceleration
Next Video: Rolling Acceleration Down an Incline
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Previous Video: Torque - Mass on Plank with String
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 03 Mar 2019 20:35:53 +0000Torque - Mass on Plank with Stringhttp://aplusphysics.com/community/index.php?/videos/view-1062-torque-mass-on-plank-with-string/Example: A 0.300 kg mass rests on a 0.395 m long, 0.764 kg, uniform wooden plank supported by a string as shown in the figure. If the mass is 0.274 m from the wall and the angle between the string and the plank is 32.1°, (a) What is the force of tension in the string? and (b) What is the normal force from the wall? Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 The problem
1:17 The free body diagram
3:45 Net torque
5:41 Substituting in numbers
6:53 Net force
8:02 The demonstration
Next Video: Rolling Without Slipping Introduction and Demonstrations
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Previous Video: 2 Masses on a Pulley - Conservation of Energy Demonstration
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 24 Feb 2019 23:10:02 +00002 Masses on a Pulley - Conservation of Energy Demonstrationhttp://aplusphysics.com/community/index.php?/videos/view-1061-2-masses-on-a-pulley-conservation-of-energy-demonstration/Example: Mass 1 and mass 2 hang from either side of a frictionless #pulley with #rotationalInertia, I, and radius, R. What is the angular acceleration of the pulley? Use #ConservationOfEnergy Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 The problem
1:01 Conservation of Energy
2:29 The mechanical energies
4:07 Solving the problem
5:57 Using arc length
Next Video: Torque - Mass on Plank with String
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Previous Video: 2 Masses on a Pulley - Torque Demonstration
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Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.Sun, 17 Feb 2019 20:35:22 +00002 Masses on a Pulley - Torque Demonstrationhttp://aplusphysics.com/community/index.php?/videos/view-1060-2-masses-on-a-pulley-torque-demonstration/Example: 0.100 kg and 0.200 kg masses hang from either side of a frictionless #Pulley with a rotational inertia of 0.0137 kg·m^2 and radius of 0.0385 m. (a) What is the #AngularAcceleration of the pulley? (b) What is the #TensionForce in each string? Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:08 The problem
1:29 The free body diagrams
2:51 Net torque on the pulley
4:28 Net forces on both masses
6:49 Tangentail acceleration
7:31 Solving for acceleration
8:55 Measuring acceleration
10:16 Solving for Tension
12:29 2 incorrect solutions
Next Video: 2 Masses on a Pulley - Conservation of Energy Demonstration
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Previous Video: Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration
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Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.Sun, 10 Feb 2019 21:54:31 +0000Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstrationhttp://aplusphysics.com/community/index.php?/videos/view-1059-using-integrals-to-derive-rotational-inertia-of-a-long-thin-rod-with-demonstration/We use integrals to derive the #rotationalinertia of a uniform, long, thin rod. And we demonstrate our answer is correct using a Rotational Inertia Demonstrator.
Want Lecture Notes? This is an AP Physics 😄 Mechanics Topic.
Content Times:
0:15 Rotational Inertia
0:42 Linear Mass Density
1:51 About Center of Mass
3:02 About an End
4:27 Rotational Inertia Demonstrator (RID)
6:09 About Center of RID
7:03 Comparing our answers
7:43 Demonstrating our answer
Next Video: 2 Masses on a Pulley - Torque Demonstration
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Graphing the Rotational Inertia of an Irregular Shape
Previous Video: How the Force of Tension on a Pulley Changes with Acceleration
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Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.Sun, 03 Feb 2019 22:00:50 +0000How the Force of Tension on a Pulley Changes with Accelerationhttp://aplusphysics.com/community/index.php?/videos/view-1058-how-the-force-of-tension-on-a-pulley-changes-with-acceleration/We predict and measure the force of tension acting on a pulley while the system is at rest and accelerating. #PulleyTensionForce Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:20 The data
0:45 Review
1:15 Tension while at rest
2:45 Accelerating tension
Next Video: Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration
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Previous Video: Graphing the Rotational Inertia of an Irregular Shape
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Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.Sun, 27 Jan 2019 23:34:52 +0000Graphing the Rotational Inertia of an Irregular Shapehttp://aplusphysics.com/community/index.php?/videos/view-1057-graphing-the-rotational-inertia-of-an-irregular-shape/We determine what data to collect to create a graph with rotational inertia as the slope of the best-fit line. #RotationalInertia - Then we collect the data and determine the rotational inertia of an irregular shape. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:11 The problem
0:46 Free Body Diagram
1:31 Net Torque
3:01 Trial #1
3:52 Angular Acceleration
5:20 12 Trials and Graph
6:29 Deriving Units
Next Video: How the Force of Tension on a Pulley Changes with Acceleration
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Previous Video: Painter on a Scaffold - Don't Fall Off!!
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Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.Sun, 20 Jan 2019 20:13:29 +0000Painter on a Scaffold - Don't Fall Off!!http://aplusphysics.com/community/index.php?/videos/view-1056-painter-on-a-scaffold-dont-fall-off/Example: What is the closest to the end of a 93 g uniform meterstick you can place a 200.0 g object and have the system stay balanced? The meterstick is supported at the 20.0 cm and 80.0 cm marks. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:03 A scaffold
0:33 The problem
1:28 Free body diagram
2:06 Net torque
3:34 Force Normal demo
4:28 Solving the problem
6:17 Testing our answer
Next Video: Graphing the Rotational Inertia of an Irregular Shape
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Previous Video: Placing the Fulcrum on a Seesaw
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 13 Jan 2019 22:13:27 +0000Placing the Fulcrum on a Seesawhttp://aplusphysics.com/community/index.php?/videos/view-1055-placing-the-fulcrum-on-a-seesaw/Example: A 200.0 g mass is placed at the 20.0 cm mark on a uniform 93 g meterstick. A 100.0 g mass is placed at the 90.0 cm mark. Where on the meterstick should the fulcrum be placed to balance the system? Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:01 Seesaw
0:33 The problem
1:28 The fulcrum
2:14 Free body diagram
2:38 Net force
3:35 Net torque
5:49 Combining equations
7:11 Testing our answer
8:11 Alternate solution
Next Video: Painter on a Scaffold - Don't Fall Off!!
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Previous Video: Introductory Rotational Equilibrium Problem
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 06 Jan 2019 21:24:28 +0000Introductory Rotational Equilibrium Problemhttp://aplusphysics.com/community/index.php?/videos/view-1054-introductory-rotational-equilibrium-problem/A uniform 0.093 kg meterstick is supported at the 15 cm and 92 cm marks. When a 0.250 kg object is placed at the 6.0 cm mark, what are the magnitudes of the forces supporting the meterstick? Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 The problem
1:35 Summing the forces
2:55 Summing the torques
5:17 Combining equations
6:04 Torque distances
7:14 The units!!
8:20 Finding Force Normal 1
9:26 Testing our answers
Next Video: Placing the Fulcrum on a Seesaw
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Previous Video: Rotational Equilibrium Introduction (and Static Equilibrium too!!)
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 16 Dec 2018 19:14:39 +0000Rotational Equilibrium Introduction (and Static Equilibrium too!!)http://aplusphysics.com/community/index.php?/videos/view-1053-rotational-equilibrium-introduction-and-static-equilibrium-too/An introduction to Rotational Equilibrium with a review of Translational Equilibrium and demonstrations. Wait there’s more … Static Equilibrium! Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 Reviewing Translational Equilibrium
1:21 Visualizing Translational Equilibrium
2:07 Rotational Equilibrium Introduction
3:09 Visualizing Rotational Equilibrium
4:22 Static Equilibrium
Next Video: Introductory Rotational Equilibrium Problem
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Previous Video: (2 of 2) Measuring the Rotational Inertia of a Bike Wheel
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 09 Dec 2018 19:54:17 +0000(2 of 2) Measuring the Rotational Inertia of a Bike Wheelhttp://aplusphysics.com/community/index.php?/videos/view-1052-2-of-2-measuring-the-rotational-inertia-of-a-bike-wheel/1) Calculating if our answer makes sense. 2) Why can’t we sum the torques on everything? 3) Finding the force of tension. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:01 Reviewing from last time
1:08 Does it make sense?
2:41 Calculating the fraction
3:41 Sum the torques on everything?
6:07 Solving for force of tension
8:24 Testing our answer
Next Video: Rotational Equilibrium Introduction (and Static Equilibrium too!!)
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Previous Video: (1 of 2) Measuring the Rotational Inertia of a Bike Wheel
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Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.Sun, 02 Dec 2018 21:06:58 +0000(1 of 2) Measuring the Rotational Inertia of a Bike Wheelhttp://aplusphysics.com/community/index.php?/videos/view-1051-1-of-2-measuring-the-rotational-inertia-of-a-bike-wheel/That’s right, we actually measure the rotational inertia of a bicycle wheel. How cool is that? Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:10 Basic setup
0:44 Free Body Diagram
1:30 Finding net torque
3:10 Finding force of tension
4:51 Linear and angular acceleration
5:42 Uniformly angularly accelerated motion
7:00 What do we need to know?
7:35 Solving the problem
Next Video: (2 of 2) Measuring the Rotational Inertia of a Bike Wheel
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Previous Video: Introductory Rotational Form of Newton's Second Law Problem
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Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.Sun, 25 Nov 2018 17:50:44 +0000Introductory Rotational Form of Newton's Second Law Problemhttp://aplusphysics.com/community/index.php?/videos/view-1050-introductory-rotational-form-of-newtons-second-law-problem/A basic rotational form of Newton’s Second Law problem with only one force. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:08 The problem
1:17 Free Body Diagram
1:37 Summing the torques
3:44 The direction
Next Video: (1 of 2) Measuring the Rotational Inertia of a Bike Wheel
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Previous Video: Introductory Rotational Form of Newton's Second Law Problem
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Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.Sun, 18 Nov 2018 18:54:22 +0000Demonstrating Rotational Inertia (or Moment of Inertia)http://aplusphysics.com/community/index.php?/videos/view-1049-demonstrating-rotational-inertia-or-moment-of-inertia/Thank you to Arbor Scientific for letting me borrow their Rotational Inertia Demonstrator to … uh … demonstrate rotational inertia. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:22 The Rotational Inertia Demonstrator
0:58 Rotational Inertia
1:40 Demonstration #1
2:00 Demonstration #2
2:55 Why always balanced?
4:30 Demonstration #3
5:27 Demonstration #4
Next Video: Introductory Rotational Form of Newton's Second Law Problem
Want a Rotational Inertia Demonstrator?
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Previous Video: Rotational Form of Newton's Second Law - Introduction
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Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.Sun, 11 Nov 2018 20:08:29 +0000Rotational Form of Newton's Second Law - Introductionhttp://aplusphysics.com/community/index.php?/videos/view-1048-rotational-form-of-newtons-second-law-introduction/A very basic introduction to the rotational form of Newton’s Second Law of Motion by way of its translational form. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:15 Newton’s Second Law
0:48 The rotational form
1:59 Using the equation
3:13 In words
Next Video: Demonstrating Rotational Inertia (or Moment of Inertia)
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Previous Video: Net Torque on a Door Problem
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Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.Sun, 04 Nov 2018 22:03:26 +0000Net Torque on a Door Problemhttp://aplusphysics.com/community/index.php?/videos/view-1047-net-torque-on-a-door-problem/Three people push on a door. We determine the net torque. Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 Translating the problem
2:00 Solving the problem
3:07 Torque Direction!
Next Video: Rotational Form of Newton's Second Law - Introduction
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Previous Video: The Right Hand Rule for Torque
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Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.Sun, 28 Oct 2018 19:13:10 +0000The Right Hand Rule for Torquehttp://aplusphysics.com/community/index.php?/videos/view-1046-the-right-hand-rule-for-torque/The right hand rule for the direction of torque is described and demonstrated six times. Want Lecture Notes?
Content Times:
0:26 The Right Hand Rule
0:47 Demonstration #1
1:27 Demonstration #2
2:37 Demonstration #3
3:20 Demonstration #4
3:40 Demonstration #5
4:24 Demonstration #6
Next Video: Net Torque on a Door Problem
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Previous Video: An Introductory Torque Wrench Problem
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Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.Sun, 21 Oct 2018 20:43:30 +0000An Introductory Torque Wrench Problemhttp://aplusphysics.com/community/index.php?/videos/view-1045-an-introductory-torque-wrench-problem/A problem involving forces on a wrench is used to determine the torque exerted by the wrench. A “cheater pipe” is also added.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 Translating the problem
2:35 Solving the problem
3:06 Arguing about the angle
4:44 Adding a “Part B”
5:40 Demonstrating the “cheater pipe”
Next Video: The Right Hand Rule for Torque
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Previous Video: Torque Introduction
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Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.Sun, 14 Oct 2018 20:11:32 +0000Torque Introductionhttp://aplusphysics.com/community/index.php?/videos/view-1044-torque-introduction/Translational and Rotational motion are demonstrated and reviewed. Torque is introduced via the equation and several door opening demonstrations. Moment arm or lever arm is defined and illustrated.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:06 Translational and Rotational Motion
0:58 Defining Torque
1:53 The torque equation
2:59 Door example #1
4:56 Door example #2
6:11 Door example #3
6:58 Defining moment arm
9:18 Torque units
Next Video: An Introductory Torque Wrench Problem
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Previous Video: Moments of Inertia of Rigid Objects with Shape
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Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.Sun, 07 Oct 2018 19:02:01 +0000Moments of Inertia of Rigid Objects with Shapehttp://aplusphysics.com/community/index.php?/videos/view-1043-moments-of-inertia-of-rigid-objects-with-shape/The moment of inertia of a system of particles equation is used to estimate six different moments of inertia of rigid objects with constant density. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:10 Visualizing the examples
1:09 How we estimate
2:16 Thin rod - center of mass
2:57 Thin rod - one end
4:00 Thin, hollow cylinder - long cylindrical axis
6:32 Solid cylinder - long cylindrical axis
8:23 Solid sphere - center of mass
9:11 Thin, hollow sphere - center of mass
10:31 Important review points
Next Video: Torque Introduction
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Previous Video: Eggs in a Carton Moment of Inertia Problem
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Thank you to Christopher Becke, Andres Ramos, and Aarti Sangwan for being my Quality Control Team for this video.Mon, 24 Sep 2018 00:26:31 +0000Eggs in a Carton Moment of Inertia Problemhttp://aplusphysics.com/community/index.php?/videos/view-1042-eggs-in-a-carton-moment-of-inertia-problem/Two equal mass eggs are placed at either end in an egg carton of negligible mass. The egg carton is initially rotated about its middle. If the egg carton is now rotated about one end, what is the final moment of inertia of the eggs relative to their initial moment of inertia? Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 Translating the problem
0:47 Initial moment of inertia
1:52 Final moment of inertia
2:46 This is a rough estimate
Next Video: Moments of Inertia of Rigid Objects with Shape
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Previous Video: Introductory Moment of Inertia and Rotational Kinetic Energy Problem
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Thank you to Christopher Becke for being my Quality Control Team for this video.Sun, 16 Sep 2018 19:21:00 +0000Introductory Moment of Inertia and Rotational Kinetic Energy Problemhttp://aplusphysics.com/community/index.php?/videos/view-1041-introductory-moment-of-inertia-and-rotational-kinetic-energy-problem/Three 20.0-gram masses are 9.4 cm from an axis of rotation and rotating at 152 revolutions per minute. What is the moment of inertia of the three-object system? The strings holding the masses are of negligible mass. Rotational Kinetic Energy is also solved for and correct units are determined. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:02 Demonstration
0:14 Translating the problem
0:57 Solving the problem
2:40 Moment of Inertia and angular velocity
3:35 Rotational Kinetic Energy
4:04 Fixing the units
6:27 Solving for joules
7:17 Comparing to Gravitational Potential Energy
Next Video: Eggs in a Carton Moment of Inertia Problem
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Previous Video: Moment of Inertia Introduction and Rotational Kinetic Energy Derivation
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Thank you to Scott Carter, Jonathan Everett, and Christopher Becke for being my Quality Control Team for this video.Sun, 09 Sep 2018 19:08:40 +0000