DAY 54

Warm-Up:

A. Copy the image from the board behind my desk. 

B. Which island will the bomb impact? 

C. Watch this movie (LINK). Describe the trajectory of the bombs as compared to the airplane

Classwork:

Last class, you should have covered new content via Flipping Physics videos (Day 53 link --> LINK)

Today we will review some of that content...

1. Intro to Proj Motion

    Click the "Lecture Notes" http://www.flippingphysics.com/projectile-motion.html

2. How to Solve a Common Problem

    Click the "Lecture Notes" http://www.flippingphysics.com/projectile-motion-problem-part-1-of-2.html

    and http://www.flippingphysics.com/projectile-motion-problem-part-2-of-2.html

HW:

Finish the CW from Day 53:

Answers:

pg 150 1-3

pg. 164 32-34

32: L to R: "constant accel; constant velocity; constant speed

33: a. A    b. all the same    c. E    d. accel is the same everywhere #Earth

34: No

#Goals: SWBAT...

1. Solve problems by using Newtons 2nd law for Rotational Motion

2. Describe Newtons 2nd law for rotation

3. Solve problems with with torques, forces, and inertia components

4. Next class: Find the CM of any object

WARM-UP & HW Check:

A. Define "Moment of Inertia"

B. If object #2 has a higher moment of inertia than object #1, will object #2 be more/less/equally resistant to acceleration?

C. Complete the Challenge Problem from pg 208 (bottom). 

D. Which equation from Table 8-2 best represents scenario A? Scenario B? C? D?

CLASSWORK:

1. Reading Quiz

2. HW Check & Review

3. Newtons 2nd law of Rotation & Ex prob 4 notes

    A. Newtons 2nd law is defined as: F=ma

    B. If we solve this equation for accel (a), we get a=F/m

    C. Similar to linear motion, for rotational motion... α=τ/I

    D. Units: rad/s2

4. Practice Problems:

    pg 210; Prac 25-29

        25: 16 rev/s

        26: 9.0 N

        27: 5.5 N

        28: 4.3 N

        29: 7.7 N

5. NEXT CLASS: Center of Mass Notes

    A. Definition: The CM of an object is the point on the object that moves in the same way that a point particle would move.

    B. What's a Point Particle???

        A point particle is where you could consider all the mass of an object to be located. (it's the CM)

    C. Procedure for locating CM

        - Demo with Lacrosse stick

    D. Stability and CM (If you missed today, look at Fig 8-13 on pg 212)

        1. An object is stable if an external force is required to lift it

    E. Conditions for Equilibrium

        - An object is in equilibrium if:

            #1: It is in translational equilibrium (Fnet=0), AND

            #2: It is in rotational equilibrium (Tnet=0)

        - Stable equilibrium vs. Unstable equilibrium

            Tutoring available after school Mon, Tues, and Wed until 4:30. Lunch almost every day.

HOMEWORK: 

CH 8 Exam is coming!! Monday 2/29 (Leap Year :))

    - Begin preparing your 1 page of notes

Add torque equations to your "Table of Friends"

Three thinking problems: pg 217 42-44