DAY 81

#Goals: SWBAT...

1. ... Memorize and use the potential energy equation

2. ... Apply a problem solving strategy to conservation of energy problems

3. ... solve conservation of energy problems

WARM-UP

Energy Transfer & Conservation of Energy?

    How is energy transferred in the following scenarios? 

    Think about 1/ how the object's velocity changes; 2/ how the object's height changes

    Create two (or three) bar graphs for each scenario (one initial, one final) showing PEi KEi and PEf KEf

    A. Roller Coaster (initial: top of the drop    final: bottom of the drop)

        https://youtu.be/t8JAXbS2Xec?t=1m30s

    B. Skiing (Initial: top of ski run    final: bottom of ski run)

        https://www.youtube.com/watch?v=VNH80LL14Vw

    C. Pendulum {3 bar graphs here} (initial: release point    middle: lowest point    high:  highest point)

        https://youtu.be/vX074Q4kP9k?t=41s

CLASSWORK

1. Problem Solving Procedure for Conservation of Energy

    review CH 11 pg 295 as a class

2. Problem solving Example & Practice

    PG 297 #15, 16, 17

3. Lab Setup 

    If you haven't yet, you'll need to read the lab

    Next, view the setup VIDEO

4. Procedure & Data Collection

    As shown in the video, you need to use time and distance data to find the final velocity. 

    Your data table should include time, distance, and final velocity info for 3 good trials. 

    Your work should show an example of the equation you used to find final velocity, and how conservation of energy allows you to find the final velocity 

HOMEWORK

- if you need to collect more data, I'll be here for lunch Friday 5/12. 

- Practice Problems: pg307 #53 & pg308 #74

#Goals: SWBAT...

1. ... Explain energy transfer in circuits

2. ... Identify instruments and tools used in circuits

3. ... Solve problems involving current, potential, and power

WARM-UP: 

1. Does an electron carry a positive, negative, or neutral charge?

2. When water begins falling off a waterfall, which two kinds of energy does it possess?

3. Copy the diagram of energy transfer from page 593. 

    a. List the flow of energy from start (waterfall) to finish (bucket moves)

    b. How is energy lost from the system?

    c. What does "Thermal Energy" mean in basic (layman's English)

CLASSWORK:

1. Reading Quiz (last one!)

2. HW Review

    - Video

    - open v. closed

    - easiest path

    - conductor v. insulator

3. Electricity Notes

    Coulomb: unit of charge. Symbol: C     1C=6.24x1018 electrons

    Two kinds of charge: positive (+) and negative (-)

    Electric charge is neither created nor destroyed. It is merely separated

    Objects with a net negative charge have excess electrons

    Objects with a net positive charge have a deficit of electrons

    Water flows from high to low

    Electric current flows from high potential to low potential

    We measure electrical current in C/s, or Amperes (amps) (symbol: A)

4. The Tools of Electricity 

    For each item (1-6), individually complete the following...

    Name:

    Description of Physical Form:

    How much it costs

    Function:

HOMEWORK: 

Copy the diagram of different circuit symbols (pg 597) into your notes. Search each term conductor, switch, fuse, etc [you can skip "electric connection and no electric connection"], and write the term and definition.