Angular Momentum

First we did Plickers, and then we did this problem together:

The answer is b, but why? No energy is lost due to friction, since there would only be static friction (to make the ball roll) and static friction doesn't take energy out of the system the way kinetic friction does.

Next we took some notes about angular momentum. There aren't a lot of notes, and what there was ended up on the whiteboard. I also have notes from a past year when I was sick: Angular Momentum. Below you will find the answers for the example problems in that guide.

Suggested homework is p. 271 #55 (look up the mass, radius, and orbital radius of Earth with The Google) & 62

Finding the angular momentum of a bike wheel:


Finding the angular momentum with a clump of mud sticking to the rim of the wheel:

Finding the new angular speed of a star that has shrunk dramatically:

One last picture with all of the equations: