All Activityhttp://aplusphysics.com/community/index.php?/discover/APlusPhysics Community - All ActivityenMoments 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
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 +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 +0000WUV Our Work 2018 MissionsI don't think anyone has ever gotten this far before. Kudos, WUV Our Work!!! 😎Thu, 14 Jun 2018 10:44:20 +0000WUV Our Work 2018 MissionsLaunch Report and Debrief
Launch Time: 10:50
Team Members Present: Kyle Upson, Alex Wansha, Julia Vanill
Play-by-Play:
launching straight up
decoupled 1:10 - stage 5
Kerbin periapsis 77 km
antennas extended 2:22
decoupled 4:14 - stage 4
2d, 05:07:39 escaped Kerbin's influence
correction RCS burn 13d, 00:22:35
orbiting towards Duna 269d, 05:26:27
setting Duna periapsis - 97,761m - 269d, 05:28:01
orbiting Duna 300d
descending onto Duna's surface 300d, 02:35:49
reached stage 1 300d, 02:46:20
landed 300d, 02:50:03
the rover has tires and we have full control over it!
Photographs:
Time of Flight: 300d, 02:53:43
Summary: The launch and flight to put a rover on Duna was another successful mission for WUV Our Work and Kerbalkind. We successfully flew to and landed on Duna with a rover and were able to control it.
Opportunities / Learnings: We learned how to get a rover on Duna and fly far from the reaches of Kerbin.
Strategies / Project Timeline: This was WUV Our Work's final mission. We are very glad that it ended with such a large goal completed, and we are proud of all of our great successes.
Milesetones: Putting a rover on Duna - $2,000,000
Available Funds: $1,048,666 - $77118 + $2,000,000 = $2,971,548!!!!Wed, 13 Jun 2018 19:17:26 +0000WUV Our Work 2018 MissionsFantastic Kerbal season!Mon, 11 Jun 2018 16:57:54 +0000BCD Venture pt 1Terrestrial exploration accomplished!Mon, 11 Jun 2018 16:57:23 +0000KT Explorations Inc.A fantastic Kerbal season!Mon, 11 Jun 2018 16:56:48 +0000WUV Our Work 2018 MissionsRed-er Rover : Pre-Launch
Team Name: WUV Our Work
Available Funds: $1,048,666
Vehicle Name: “Red-er Rover”
Vehicle Parts List and Cost:
RoveMax Model M1 (x4) - 450
Cubic Octagonal Strut (x7) - 16
EAS-4 Strut Connector (x18) - 42
RV-105 RCS Thruster Block (x8) - DISCOUNT 310
Mk12-R Radial-Mount Drogue Chute (x4) - 150
Mk2-R Radial-Mount Parachute (x4) - 400
Communotron 88-88 - 1500
SP-W 3x2 Photovoltaic Panels (x2) - 440
Z-200 Rechargeable Battery Bank (x2) - 360
OX-STAT Photovoltaic Panels (x2) - 75
Probodobodyne HECS - 650
FL-R10 RCS Fuel Tank - 200
TT-38K Radial Decoupler - 600
AE-FF3 Airstream Protective Shell (3.75m) - 1,104
FL-R10 RCS Fuel Tank - 200
Rockomax X200-16 Fuel Tank - 1,550 RE-L10 "Poodle" Liquid Fuel Engine - DISCOUNT 650
Rockomax X200-32 Fuel Tank - 3,000
Rockomax Jumbo-64 Fuel Tank (x2) - 5,750
RE-M3 "Mainsail" Liquid Engine - DISCOUNT 6,500
S1 SRB-KD25k "Kickback" Solid Fuel Booster (x8) - 2,700
TT-70 Radial Decoupler (x4) - 700
Structural Wing Type C (x4) - 300
Delta Wing (x4) - 600
Rockomax Brand Adapter (x2) - 550
Advanced Nose Cone - Type B (x8) - 320
TOTAL COST: 77,118
Design Goals: Our goal is to land a rover on Duna. To do this we need to be able to dramatically slow down in a considerably thinner atmosphere.
Launch Goal: We are hoping to learn how to effectively land and maneuver a rover on Duna’s surface.
Milestone:
Land a Rover on Duna - $2,000,000
Pilot Plan:
Launch and begin angling rocket at 20km
Adjust rocket to achieve circular orbit
Reach escape velocity out of Kerbin orbit
Plan/execute an encounter with Duna
Land softly in the thin atmosphereMon, 11 Jun 2018 14:54:50 +0000BCD Venture pt 1Name: BCD Ventures
Launch Time: Friday June 8, 10:55 AM
Team Members Present: Jeremiah Cottrill, Kara Davis, Riley Broderick
Play-by-Play: Full throttle off the runway and a straight flight to the ice cap. Fuel ran out quickly so a landing approximately near the UFO site was made and then
Photographs:
Time-of-Flight: 0y, 0d, 00:35:38
Summary: All the goal we have set out to complete were met.
Opportunities / Learnings:
Getting your bearings on Kerbin was key to fuel use.
Strategies / Project Timeline:
We will now have much more plentiful funds and resources to work with, allowing us to greatly accelerate the development of BCD Ventures's space program.
Milestone Awards Presented:
Picture of UFO on northern ice cap of Kerbin - $50,000 (Half)
Available Funds: 140430 + Rewards (50,000) - 13,330 = 157100Mon, 11 Jun 2018 14:41:30 +0000Public Service Broadcasting "The Race For Space" EssayLmao, I'm happy with this story.Mon, 11 Jun 2018 05:09:56 +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 +0000BCD Venture pt 1Name: BCD Ventures
Available Funds: 140,430
Vehicle Name: Aeris 3A
Vehicle Part List and Cost:
We used the Aeris 3A stock airplane for this flight however, as far as we know there's no way to see what parts were used in the stock craft. There appears to be only one Mk 1Fuselages in the entire craft and the discount was calculated accordingly.
Total Cost: 13,330 Funds (including fuel discount)
Design Goals: Fly to the northern ice cap and snap a screenshot of the UFO landing.
Launch Goal: We are hoping to achieve the milestones: Picture of UFO on northern ice cap of Kerbin - $50,000
Pilot Plan: This is a manned flight to the northern ice cap. Near surface flight and conservative fuel use will be observed during the trip.Fri, 08 Jun 2018 15:00:29 +0000