s2w6 FC Angular momentum

If the rotational speed of an object doubles, its angular momentum...

What should happen to a spinning object's angular momentum if no external torques act on it?

A student says that when you execute a somersault and pull your arms and legs inward, you increase your angular momentum. How do you correct that student?

An Ice Skater begins to spin at a velocity of 2 rev/s in the following position

When she shifts positions, she increases her speed to 4.3 rev/s. Her new position looks like this.

how much did shifting her position change her moment of inertia? On-level - there is a hint to help you step through this problem if you need. Honors - try without the hint.

A skater looks at these two pictures and guesses that the skater has more or less then same moment of inertia in both poses.

A gymnast disagrees and says that the first one has a significantly higher moment of inertia. An understanding coach says they are both right. What difference do you see about the perspectives of the skater and the gymnast that could mean that they are both right?

Read the rest of chapter 7: Centripetal force to the end of the chapter. Do you have any questions?

Review from a couple weeks ago - what is tangential speed?

When a car makes a sharp turn around a curve, the feeling of being pushed away from the center of the curve is due to:

This video gave a clear answer to the question of whether centrifugal force was the 3rd-law force pair of centripetal force: what was it?

make a multiple choice question about centripetal vs centrifugal force. Make sure at least two of the wrong answers are plausible.

describe some of the forces that create centripetal force in a car doing doughnuts in a parking lot.

this is cool.

Which of the following would not be a internal torque, but an external torque that would change the angular momentum of the system

This should look a lot like the bouncing nerf bullet from earlier in the session: reversing the angular momentum of the wheel to be negative is similar to making the nerf bullet bounce backwards, which then means the block now has 2x the initial momentum of the bullet. with the nerf bullets we created an inelastic transfer of momentum by sticking the bullet to the cardboard with hot glue. What experiment would you do to show something similar here?

Oh hey, this is a more explicit explanation answering the question in the first video. This is super cool too.