**Week 5:**

**Universal Gravity, 2-D kinematics**

**Day 1:** **2D mechanics (no trig).**

**Before class**

- Do PS #4, on main website – First Question is Revision of MT#1 (answers and comments are posted on main website). But it’s not due until Tuesday, tomorrow. I added a last question about the string breaking ball.
- It is a good idea to read through the problem set before seeing the videos so you know where the information
- See the video on 2D work
- See video on 2D momentum transfer
- Read 3.6 and see video: Boat on the River Problem Solution Explained
- PS#5 is posted. It is due next Monday.

**In Class**

- Talk about projects – Project proposal due by midnight this Friday, April 29.
- PS #4 due

**After Class**

**Day 2:** **(Inclined Plane)**

**Before class**

- Finish
**PERFECT**MT#1. - See this video on estimating vector components again if you like. It was assigned for last Thursday, but is worth looking at again (in my opinion).
- See this video about the mass on the inclined plane
- See this video of work on an inclined plane.

**In Class**

- MT#1 corrections Due

**After Class**

**Day 3:**

**Before class**

- I wrote up solutions for MT#1. Please check them out on the main page.
- See video on Universal Gravity and Inverse Square Law
- Veritassium music gravity video
- See video on Inclined Plane using Only Energy (no kinematics at all!)
- From Textbook: Read the first half of section 6.5, up to (but not including) example 6.6
- I added a question to PS #5 (posted on main website), so there are 6 questions now.

**In Class:**

Big Exam #3

Get Feedback Cards for Tomorrow

**After Class**

**Day 4:** **(Universal Gravity)**

Integrate force to find potential energy for gravitational potential energy (graphs).

Use Conservation of energy in order to find velocity at different distances from a planet.**Before class**

- Veritassium about Newton’s 3rd and gravity
__Escape Velocity__- Gravitational Potential Energy Graphs
- Fill out feedback cards for class.
- By midnight this Friday, your group will post a proposal for the group video project. The link is on the main webpage

**After Class**

Please see updated problem set including today’s class work due Monday.