
Communication of the week:
 2019.04.08: "this is very helpful for visualizing the basic relationship between the two, having an actual movie in your head is worth a thousand pages, thanks v much." Luke Nilsen  YouTube Comment
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 Mr.p, Billy, Bobby, Bo.
 Mr.p, Billy, Bobby, Bo.
Most Recent Video (2019.04.14)
MerryGoRound  Conservation of Angular Momentum Problem (10:31)
A 25 kg child is sitting on the edge of a #merrygoround. The merrygoround has a mass of 255 kg and is rotating at 2.0 radians per second. The child crawls to the middle of the merrygoround. What is the final angular speed of the merrygoround? You may make the following estimations: The child is a point particle; the merrygoround is a solid disk and has an axle with negligible friction. 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 is positive. 

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