**Day 1:**

*This may be edited until Sunday Morning, 10:00 AM*

__Conserving Angular Momentum, when Sum of the Torque = zero__

- Angular momentum =
*I*alpha,*like linear momentum = m*v*kind of* - Torque
=**SOMETIMES***I * alpha*, as stated above in rotational dynamics. Torque= rate of change of angular momentum*ALWAYS* - For instance if Torque = zero, then angular momentum is conserved (just like we conserve momentum if there’s no outside force)
*it doesn’t mean that alpha = zero, like acceleration = 0 if the sum of the forces = 0*

**Before Class**

- Collect PS #9, Hand back PS#8. PS#10 has been posted.
- Read 10.5 in your text and check out example 10.14
- Please watch this video on torque = time derivative of angular momentum
- Please see video on Coriolis Effect , made by students from Fall, 2014
- PS#9 due next week has been posted. Please take a look at it.
- I posted my summary and reflection from your week 8 feedback on the main webpage

**In Class:**

**Day 2:**

How can a point mass (with no radius and no moment of inertia) have angular momentum? It all depends on the *impact parameter!!*

**Before Class**

- Angular Momentum of a Point Mass
**Bullet Hits Block Veritassium**- I posted my summary and reflection from your week 8 feedback on the main webpage
- MT#2 Solutions posted on main class page.

**In Class**

- Big Exam #5

**After Class**

**Day 3:**

**Before Class**

- Please see the video on angular momentum: Wheel Kick and Figure Skating
**Veritassium Which Block Goes Higher?**

**In Class**

**After Class**

- Why does the water stay in the bottom of the bucket?
- Where on the earth do you weigh more?

**Day 4:**

Precession:

Torque is rate of change of angular momentum so dL = (torque)*dt. However, angular momentum is a vector, so you also need torque to change the *direction* of angular momentum.**Before Class**

- Please see video describing Precession and read 10.8 in your text about precession.
- Rotational Big Picture
__Explanation of Veritassium Bullet Problem__

**In Class**

Review difficulties on PS#8, and also group work for PS#9

**Day 5 (??): Friday. You have until midnight tonight to post your link on the website for full credit.**