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This NASA video segment explores how Newton's laws apply to the takeoff of an airplane. Viewers watch an instructor and engineer at NASA's National Test Pilot School and learn that there are four opposing forces on an airplane, that takeoff is the point at which the lift just starts to offset the weight, and that the distance needed for takeoff can be calculated using an equation derived from Newton's second law. The video clip also discusses the extra drag force created by the rolling friction of the airplane's wheels. Run time 13:13.
Found by Larry Sanger in Application of Newton's Laws
June 30, 2009 at 12:00 PM
Ages: 10 - 18
License: CC by
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A 25 kg child is sitting on the edge of a #merry-go-round. The merry-go-round has a mass of 255 kg and is rotating at 2.0 radians per second. The child crawls to the middle of the merry-go-round. What is the final angular speed of the merry-go-round? You may make the following estimations: The child is a point particle; the merry-go-round is a solid disk and has an axle with negligible friction. #AngularMomentumConservation Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:07 Translating the problem from words to physics.
1:32 Why the angular momentum of the system is conserved.
3:21 Using the equations for angular momentum and rotational inertia.
4:22 Substituting in equations and variables to solve the problem.
6:06 Understanding why the angular velocity of the system increased.
7:44 Finding the change in kinetic energy of the system.
8:55 Understanding why the change in kinetic energy of the system is positive.
Next Video: Which Direction will the Wheel Accelerate?
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Previous Video: Wheel Conservation of Angular Momentum Demonstration and Solution
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Thank you to Scott Carter, Cameron Vongsawan, and Christopher Becke for being my Quality Control Team for this video.
Found by Flipping Physics in Rotational Motion
April 14, 2019 at 01:51 PM
Ages: 12 - 18
License: Proprietary
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By the time students learn about all the equations for mechanical energy, momentum, impulse and impact force, they often start to confuse the equations with one another. This is a straightforward, simple look at all of those equations and when to use them.
This is an AP Physics 1 Topic. Want Lecture Notes?
Content Times:
0:14 Tacky Sweater Day!
0:22 Conservation of Mechanical Energy
0:54 Work due to Friction equals Change in Mechanical Energy
1:30 Net Work equals change in Kinetic Energy
3:01 Conservation of Momentum does NOT require the work due to friction to be zero
3:28 The initial and final points when dealing with momentum are predetermined
3:56 Impulse does not equal Impact Force
Thank you to Sophie Jones and her family for letting me use six of their sweaters in this video!
Next Video: 2D Conservation of Momentum Example using Air Hockey Discs
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Previous Video: Impulse Comparison of Three Different Demonstrations
Please support me on Patreon!
Thank you to my Quality Control help: Christopher Becke, Scott Carter and Jennifer Larsen
Found by Flipping Physics in Momentum
February 9, 2017 at 12:43 PM
Ages: 11 - 18
License: Proprietary
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This video uses balancing on a unicycle as an example to explain net force (mass x acceleration). It explains how all of the outside forces, such as gravity, contact force, and friction help to create balance when riding a unicycle. It also explains counter-steering to move the point of contact and control the direction of the unicycle. (4:32)
Found by TracyMoon in Force & Balance
May 27, 2012 at 09:58 AM
Ages: 12 - 18
License: Proprietary
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Tony Hawk Skates First Downward Spiral Loop: A behind the scenes look at the idea, the build and the stunt. We talked with Tony about an idea of creating a Helix shaped ramp that could be skated from top to bottom and he was excited but also a little nervous. To make it all the way around and out, he needed a combination of the right speed, centrifugal force and friction to keep him on the vertical wall. Thanks to Sony for funding this dream and the help of Sony Action Cameras to capture the event. (04:30)
Found by teresahopson in Hawk, Tony
January 6, 2023 at 04:32 PM
Ages: 14 - 18
License: Proprietary
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