PhySP18SS5.1.1 Time Stamp — Those Intel Drones were very impressive at the Opening Ceremonies.

PhySP18SS5.1.2 You all wrote the four questions. Now I just have to pick out the ones I want to use.

PhySP18SS5.1.3 This is the big picture of Physics. We only study the Mechanics part.

PhySP18SS5.1.4 Here are the two branches of Physics

PhySP18SS5.1.5 Here are the big three conservation laws that run mechanics

PhySP18SS5.1.6 We are going to study lil p for a bit. It’s actually a lil suitcase. with even a smaller suitcase inside it.

PhySP18SS5.1.7: Inertia and momentum

PhySP18SS5.1.8 It’s not really lil p that we are so interested in . . . it is CONSERVATION of a systems lil p that is so awesome. It’s one of the big three laws that runs pretty much the whole show.

PhySP18SS5.1.9 Con of Mom can be broken down into four equations, but they are really

PhySP18SS5.1.10 Conservation of energy gets more complicated to more you look at it. Especially when that old dog PacMan gets involved.

PhySP18SS5.1.11 That equation on the bottom is the beginning of the Ultimate Fighting Tool. We will barely get to it this year, but you will use the heck out of it next year in AP Physics . . . and in college.

PhySP18SS5.1.12 Conservation of Angular Momentum is another one that gets more and more complicated the more you dive into it.

PhySP18SS5.1.13 For every equation in linear world there is a corresponding equation in Circular World.

PhySP18SS5.1.14 . . . I kept this slide because it has the definition of Moment of Inertia. We will discuss that later.

PhySP18SS5.1.15 Basic elastic collision

PhySP18SS5.1.16 Basic elastic collision with numbers

PhySP18SS5.1.17 . . .

PhySP18SS5.1.18 The first boxes on sheet 5.1

PhySP18SS5.1.19 $5000 wasted

PhySP18SS5.1.20 5.1.1

PhySP18SS5.1.21 5.1.2

PhySP18SS5.1.22 sheet 5.1.4

PhySP18SS5.1.23 Sheet 5.1.8 (Key is posted on Facebook)

PhySP18SS5.1.24 Sheet 5.2.1

PhySP18SS5.1.25 another one of 5.2.1

PhySP18SS5.1.26 Sheet 5.2.2

PhySP18SS5.1.27 Sheet 5.2.3

PhySP18SS5.1.28 Sheet 5.2.3

PhySP18SS5.1.29 Conservation of momentum in a “strike” in pool. The initial momentum of the cue ball is transferred to all those numbered pool balls. No momentum is lost. It is all just transferred. That blew me away in college at first until, one night I was laying in bed staring at the ceiling and it finally hit me. MOMENTUM IS A VECTOR. Which simply means the big initial arrow of the cue ball (containing its mass and velocity) gets transfomed into 16 different arrows. How can this happen? Because much of those arrows cancel each other. Check out this picture. If you assume the cue ball is originally moving ONLY in the y direction, all the x components are going to cancel each other. All the final momentum y components will add up to the original momentum of the cue ball. I was so excited by my epiphany that I got out of bed and did a naked glorious jig in my bedroom.

PhySP18SS5.1.30 Now take this idea of con of mom to a bigger level. Shoot a firework shell into the air. After the explosion, the 1000 momentums of all those colorful 3D scintillations when added up equal the original momentum of the sheel JUST BEFORE EXPLOSION. So . . . if you follow the combined vectors of all the scintillations, it will complete the parabolic type 2A projectile motion that the original shell had. Ha!! Good Grief . . . I love physics so much.