Merry-Go-Round - Conservation of Angular Momentum Problem

A 25 kg child is sitting on the edge of a #MerryGoRound. 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? https://www.flippingphysics.com/merry-go-round-conservation.html This is an AP Physics 1 Topic.

0:00 Intro
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?
https://www.flippingphysics.com/wheel-rope-acceleration-direction.html

Multilingual? Please help translate Flipping Physics videos!
http://www.flippingphysics.com/translate.html

Previous Video: Wheel Conservation of Angular Momentum Demonstration and Solution
https://www.flippingphysics.com/wheel-angular-momentum-conservation.html

Please support me on Patreon!
http://patreon.com/FlippingPhysics

Thank you to Scott Carter, Cameron Vongsawan, and Christopher Becke for being my Quality Control Team for this video. http://flippingphysics.com/quality-control.html

Thank you to Jonathan Sullivan-Wood for transcribing the English subtitles of this video.

Видео Merry-Go-Round - Conservation of Angular Momentum Problem канала Flipping Physics