Merry-Go-Round - Conservation of Angular Momentum Problem (10:31)
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. This is an AP Physics 1 Topic.
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 is positive
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