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, kind of like linear momentum = m*v
- Torque SOMETIMES = I * alpha, as stated above in rotational dynamics. Torque ALWAYS = rate of change of angular momentum
- 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.