APlusPhysics Forumshttp://aplusphysics.com/community/index.php?/discover/13/APlusPhysics Community - APlusPhysics ForumsenMoments 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
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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
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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
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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 +0000Moment of Inertia Introduction and Rotational Kinetic Energy Derivationhttp://aplusphysics.com/community/index.php?/videos/view-1040-moment-of-inertia-introduction-and-rotational-kinetic-energy-derivation/The concept of kinetic energy applied to a stationary, rotating wheel is used to define Moment of Inertia and derive Rotational Kinetic Energy. Moment of Inertia is demonstrated. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 Kinetic Energy of rotation
2:24 Defining Moment of Inertia
3:00 Defining Rotational Kinetic Energy
4:29 “Rotational Mass”
5:44 Demonstration #1
6:45 Demonstration #2
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Previous Video: Conical Pendulum Demonstration and Problem
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Thank you to Scott Carter, Kevin Kulka, Jonathan Everett, and Christopher Becke for being my Quality Control Team for this video.Sun, 02 Sep 2018 16:09:43 +0000Center of Mass Introductionhttp://aplusphysics.com/community/index.php?/videos/view-1039-center-of-mass-introduction/Sun, 26 Aug 2018 19:43:54 +0000Throwing a Ball in a Boat - Demonstrating Center of Masshttp://aplusphysics.com/community/index.php?/videos/view-1038-throwing-a-ball-in-a-boat-demonstrating-center-of-mass/When I throw a massive ball to the left such that it lands in the other end of the canoe, what will happen to the positions of the objects? What if the ball does not land in the canoe? This video provides answers and solutions to those questions. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 Ball lands in canoe center of mass question
0:52 Demonstrating the answer
1:16 Explaining the answer
3:31 What is the ball lands outside the canoe?
4:28 Demonstrating the answer
5:08 The math solution
8:03 The physics works!
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Previous Video: Center of Mass of an Object with a Hole
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Thank you to Will Longsworth, Christopher Becke, Jonathan Everett, Scott Carter, and Aarti Sangwan for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 19 Aug 2018 21:13:14 +0000Center of Mass of an Object with a Holehttp://aplusphysics.com/community/index.php?/videos/view-1037-center-of-mass-of-an-object-with-a-hole/How to find the center of mass of an object with a missing piece. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 The problem
1:18 Center of mass locations
2:59 Solving the problem
5:14 Testing the answer
Next Video: Throwing a Ball in a Boat - Demonstrating Center of Mass
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Previous Video: Center of Mass of an Irregular Object
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Thank you to Christopher Becke, Jonathan Everett, 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.Mon, 13 Aug 2018 14:03:55 +0000Center of Mass of an Irregular Objecthttp://aplusphysics.com/community/index.php?/videos/view-1036-center-of-mass-of-an-irregular-object/How to find the center of mass of an irregularly shaped, flat object. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:08 The problem
0:57 Translating the problem
2:52 Area instead of mass
4:42 Solving the problem
6:05 Understanding the answer
Next Video: Center of Mass of an Object with a Hole
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Previous Video: Calculating the Center of Mass of a System of Particles
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Thank you to Christopher Becke, Jonathan Everett, Scott Carter, and Aarti Sangwan for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Mon, 06 Aug 2018 18:46:45 +0000Calculating the Center of Mass of a System of Particleshttp://aplusphysics.com/community/index.php?/videos/view-1035-calculating-the-center-of-mass-of-a-system-of-particles/Three point objects are located at various locations on a Cartesian coordinate system. Mass 1, with a mass of 1.1 kg, is located at (1.0,1.5) m. Mass 2, with a mass of 3.4 kg, is located at (3.0,1.0) m. Mass 3, with a mass of 1.3 kg, is located at (1.5,2.5) m. Where is the center of mass of the three-object system? Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 The problem
2:30 The equation
4:16 Solving the problem
5:51 Not the centroid!
Next Video: Center of Mass of an Irregular Object
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Previous Video: Do Your Feet Affect How Far You Slide on a Water Slide?
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Thank you to Christopher Becke, Jonathan Everett, Scott Carter, Kathy Willard, and Kevin Kulka for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.
Picture credits:
Cartesian Coordinate System https://commons.wikimedia.org/wiki/File:Cartesian-coordinate-system.svg
René Descartes https://commons.wikimedia.org/wiki/File:Frans_Hals_-_Portret_van_René_Descartes.jpgWed, 01 Aug 2018 18:10:51 +0000Harnessing the Power of Spreadsheets in Physicshttp://aplusphysics.com/community/index.php?/videos/view-1034-harnessing-the-power-of-spreadsheets-in-physics/Basic demonstration of how to use spreadsheets in an introductory physics class. Topics listed below. This is an AP Physics 1 topic.
Content Times:
0:33 Basic data collection
0:58 Inputting data
3:45 Equations
8:39 Graphs or charts
12:40 Correcting mistakes
14:08 Formatting charts
15:23 Best-fit lines or trendlines
19:52 Helpful tips
21:50 Printing
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Another Video: Introduction to Projectile Motion
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Thank you to Scott Carter, Christopher Becke, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 22 Jul 2018 21:55:30 +0000Creating Circular Motion from Sine and Cosine Curveshttp://aplusphysics.com/community/index.php?/videos/view-1033-creating-circular-motion-from-sine-and-cosine-curves/Demonstrating how sine and cosine simple harmonic motion waves can create circular motion. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 y-position
0:31 x-position
1:35 Combining motions
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Previous Video: Demonstrating Position, Velocity, and Acceleration of a Mass-Spring System
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Thank you to Scott Carter, Christopher Becke, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 15 Jul 2018 21:01:19 +0000Demonstrating Position, Velocity, and Acceleration of a Mass-Spring Systemhttp://aplusphysics.com/community/index.php?/videos/view-1032-demonstrating-position-velocity-and-acceleration-of-a-mass-spring-system/A “live” demonstration of of collecting position, velocity, and acceleration of a vertical mass-spring system.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:30 The basic setup
1:24 The equations
2:15 Position vs. Time
3:20 Velocity vs. Time
3:58 Acceleration vs. Time
5:20 Determining Period
7:09 Determining Spring Constant
8:14 Best-fit sine curve
Next Video: Creating Circular Motion from Sine and Cosine Curves
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Previous Video: Simple Harmonic Motion - Graphs of Mechanical Energies
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Thank you to Christopher Becke for being the sole member of my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 15 Jul 2018 20:58:33 +0000Simple Harmonic Motion - Graphs of Mechanical Energieshttp://aplusphysics.com/community/index.php?/videos/view-1031-simple-harmonic-motion-graphs-of-mechanical-energies/Kinetic energy and elastic potential energy as functions of time graphs for a horizontal mass-spring system in simple harmonic motion are demonstrated. Conservation of energy is shown.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:12 The positions
0:40 Kinetic energy
1:49 Elastic potential energy
2:44 Total mechanical energy
5:10 Including friction
Next Video: Demonstrating Position, Velocity, and Acceleration of a Mass-Spring System
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Previous Video: Simple Harmonic Motion - Graphs of Position, Velocity, and Acceleration
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Thank you to Scott Carter, Christopher Becke, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 15 Jul 2018 20:55:54 +0000Simple Harmonic Motion - Graphs of Position, Velocity, and Accelerationhttp://aplusphysics.com/community/index.php?/videos/view-1030-simple-harmonic-motion-graphs-of-position-velocity-and-acceleration/Position, velocity, and acceleration as a function of time graphs for an object in simple harmonic motion are shown and demonstrated. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 Reviewing the equations
1:46 Position graph
2:50 Velocity graph
4:10 Acceleration graph
5:48 Velocity from position
7:19 Acceleration from velocity
Next Video: Simple Harmonic Motion - Graphs of Mechanical Energies
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Previous Video: Simple Harmonic Motion - Velocity and Acceleration Equation Derivations
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Thank you to Scott Carter, Christopher Becke, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 24 Jun 2018 18:23:26 +0000Simple Harmonic Motion - Velocity and Acceleration Equation Derivationshttp://aplusphysics.com/community/index.php?/videos/view-1029-simple-harmonic-motion-velocity-and-acceleration-equation-derivations/Deriving the velocity and acceleration equations for an object in simple harmonic motion. Uses calculus. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 Reviewing the position equation
2:08 Deriving the velocity equation
3:54 Deriving the acceleration equation
Next Video: Simple Harmonic Motion - Graphs of Position, Velocity, and Acceleration
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Previous Video: Simple Harmonic Motion - Position Equation Derivation
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Thank you to Scott Carter, Christopher Becke, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Mon, 18 Jun 2018 09:54:03 +0000Simple Harmonic Motion - Position Equation Derivationhttp://aplusphysics.com/community/index.php?/videos/view-1028-simple-harmonic-motion-position-equation-derivation/Deriving the position equation for an object in simple harmonic motion. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 Reviewing circular motion vs. simple harmonic motion
0:24 Defining x position
1:13 Using angular velocity
3:18 The position equation
3:31 Visualizing the position equation
5:16 The phase constant
6:49 Angular frequency
Next Video: Simple Harmonic Motion - Velocity and Acceleration Equation Derivations
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Previous Video: Comparing Simple Harmonic Motion to Circular Motion - Demonstration
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Thank you to Andres Ramos, Sawdog, Christopher Becke, Scott Carter, and Jonathan Everett for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 10 Jun 2018 18:31:53 +0000Comparing Simple Harmonic Motion to Circular Motion - Demonstrationhttp://aplusphysics.com/community/index.php?/videos/view-1027-comparing-simple-harmonic-motion-to-circular-motion-demonstration/Demonstrating that Circular Motion, when viewed from the side, is Simple Harmonic Motion. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:17 The demonstration
1:21 Position vs. time
Next Video: Simple Harmonic Motion - Position Equation Derivation
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Previous Video: Frequency vs. Period in Simple Harmonic Motion
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Thank you to Christopher Becke, Andres Ramos, Aarti Sangwan, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Sun, 03 Jun 2018 14:31:11 +0000Frequency vs. Period in Simple Harmonic Motionhttp://aplusphysics.com/community/index.php?/videos/view-1026-frequency-vs-period-in-simple-harmonic-motion/Frequency, f, is defined and related to Period, T. Two demonstrations are shown and frequency solved for.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:13 Definition of period, T
1:00 Definition of frequency, f
1:40 Demonstration #1
3:05 Demonstration #2
Next Video: Comparing Simple Harmonic Motion to Circular Motion - Demonstration
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Previous Video: Triple the Mass in a Mass-Spring System. How does Period Change?
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Thank you to Christopher Becke, Andres Ramos, Aarti Sangwan, and Sawdog for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Tue, 29 May 2018 17:55:37 +0000Triple the Mass in a Mass-Spring System. How does Period Change?http://aplusphysics.com/community/index.php?/videos/view-1025-triple-the-mass-in-a-mass-spring-system-how-does-period-change/If the mass in a mass-spring system is tripled, how does the period change? Solution is worked out and then demonstrated.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 Translating the problem
0:27 Solving the problem
1:32 Demonstrating the solution
Thank you to Anish, Kevin, and Olivia for being my “substitute students” in this video!
Next Video: Frequency vs. Period in Simple Harmonic Motion
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Previous Video: Demonstrating What Changes the Period of Simple Harmonic Motion
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Thank you to Aarti Sangwan, Sawdog, and Christopher Beckefor being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Mon, 21 May 2018 13:12:50 +0000<![CDATA[AP Physics C: Electricity and Magnetism (E&M) 2018 Free Response Solutions]]>http://aplusphysics.com/community/index.php?/videos/view-1024-ap-physics-c-electricity-and-magnetism-em-2018-free-response-solutions/Fri, 18 May 2018 14:48:44 +0000AP Physics C: Mechanics 2018 Free Response Solutionshttp://aplusphysics.com/community/index.php?/videos/view-1023-ap-physics-c-mechanics-2018-free-response-solutions/Thu, 17 May 2018 15:44:02 +0000AP Physics 2 2018 Free Response Solutionshttp://aplusphysics.com/community/index.php?/videos/view-1022-ap-physics-2-2018-free-response-solutions/Walk-through of the 2018 AP Physics 2 Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pdf/ap18-frq-physics-2.pdf
For more information, please visit http://aplusphysics.com
*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.Tue, 15 May 2018 12:58:50 +0000AP Physics 1 2018 Free Response Solutionshttp://aplusphysics.com/community/index.php?/videos/view-1021-ap-physics-1-2018-free-response-solutions/Walk-through of the 2018 AP Physics 1 Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pdf/ap18-frq-physics-1.pdf
For more information, please visit http://aplusphysics.com
*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.Mon, 14 May 2018 22:39:40 +0000Demonstrating What Changes the Period of Simple Harmonic Motionhttp://aplusphysics.com/community/index.php?/videos/view-1020-demonstrating-what-changes-the-period-of-simple-harmonic-motion/Period of simple harmonic motion is defined and demonstrated. Equations for period of mass-spring systems and pendulums are given. What changes the period is demonstrated.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:01 Defining period, T
0:47 Demonstrating period
2:50 Period equations
4:00 Does amplitude affect T?
4:35 Does g affect T for mass-spring system?
4:54 Does mass affect T for pendulum?
5:40 Increase mass in mass-spring system?
6:01 Increase k in mass-spring system?
6:24 Increase pendulum length?
6:50 Increase g for a pendulum?
7:26 Does A really not affect pendulum?
Thank you to Anish, Kevin, and Olivia for being my “substitute students” in this video!
Next Video: Triple the Mass in a Mass-Spring System. How does Period Change?
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Previous Video: When is a Pendulum in Simple Harmonic Motion?
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Thank you to Aarti Sangwan, Sawdog, and Christopher Beckefor being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Mon, 14 May 2018 00:54:39 +0000A Tale of Three Accelerationshttp://aplusphysics.com/community/index.php?/videos/view-1019-a-tale-of-three-accelerations/A Silent Film in honor of #DayofSilence to clarify the differences between angular, tangential, and centripetal accelerations. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:20 The three accelerations
0:43 One difference is their units
1:22 How are tangential and centripetal acceleration different?
2:10 Which accelerations are required for circular motion?
3:01 What happens at constant angular velocity?
3:31 More about angular acceleration
4:25 Review
Thank you Bronson Hoover of dnbstudios for your original music composition. Your music offer was the video’s catalyst.
“What will you do to end the silence?"
Next Video: Conical Pendulum Demonstration and Problem
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Previous Video: The Right Hand Rule for Angular Velocity and Angular Displacement
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Thank you to Bilge Deniz Kocak, Sawdog, and Christopher Becke for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.Wed, 02 May 2018 20:29:04 +0000