DAY 130

Watch this first:

Part 1: https://youtu.be/q73ZIJfzjGU

Part 2: https://youtu.be/q0tyP9Lyzik

Essential Question: How can energy be transferred?

GOALS: SWBAT...

1. Define five mechanical advantage related terms

2. Create a pulley system which decreases effort force and increase mechanical advantage

WARM-UP 130

1. Consider the image shown on page 256 of your textbook (here's the LINK). How does a multi-speed bicycle enable a cyclist to ride over any terrain with the least effort? Hint: consider the different radii of the circular gearsets attached to the front and rear wheels

CLASSWORK

1. 130A: Mechanical Advantage

Read pages 266-267. While reading, list and define the following terms in your notes

    a. effort force (copy the symbol as well)

    b. resistance force (copy the symbol as well)

    c. mechanical advantage (copy the equation as well)

    d. ideal mechanical advantage (copy the equation as well)

    e. load (as it relates to engineering and physics)

2. 130B: Applying Mechanical Advantage Concepts

    a. Pg 266 Figure 10-9. 

        1. What kind of simple machine is the bottle opener?

        2. Scissors use a small effort force from your hand over a large displacement. They convert that into a large resistance force applied over a small displacement to do cutting. How does a bottle opener work? 

    b. Pg 267 Figure 10-10:

        3. What kind of simple machine is shown here? 

        4. When pulling down on a single fixed pulley attached to the ceiling, is there any mechanical advantage? 

        5. What is the benefit of being able to lift a mass by using a rope/pulley attached to the ceiling?

        6. Make the two pulley systems shown in figure 10-10 using the simulator listed below. Which has a greater MA? Why?

        https://interactives.ck12.org/simulations/physics/block-and-tackle/app/index.html?lang=en&referrer=ck12Launcher&backUrl=https://interactives.ck12.org/simulations/physics.html

        7. EXIT QUESTIONS: Answer the three "challenge me" questions from the top right corner of the screen

Learning at Home 

1. What kind of pulley system did you use in your Rube Goldberg?

2. What MA did it have?

3. Want to play around will pulleys? Try this simulator... Really fun! (doesn't work on iPhone iPad as it uses Flash)

       http://www.compassproject.net/sims/pulley.html

2. Use the concept of mechanical advantage to explain how gears on a bicycle make pedaling easier.

Essential Questions:What is a wave? 

Goals: SWBAT...

1. Discuss waves’ properties using common vocabulary and they will be able to predict the behavior of waves 

2. Describe how changing one characteristic of a wave affect the other characteristics.

Warm-Up (5min): 

1. When waves reach the end the material thru which they're traveling, they get reflected. What does "reflected" mean?

2. What is the difference between a wave reflected off a fixed end vs. a loose end? 

3. What is a standing wave? Set your sim to Oscillate, No End, Amp: 0.67cm, Freq: 1.53, Damping: none, Tension: Medium and see if you can make one. 

Waves on a String: https://phet.colorado.edu/en/simulation/wave-on-a-string

CLASSWORK

1. Review #129A: Waves on a String

2. 130A: Guided Reading: Waves

    Make a copy and save to your Google Docs. Edit your copy. LINK

    Reading Materials: LINK

At Home Learning (HW) 

1.  Friday. Tomorrow we will have a summative lab to review this week's learning, and a short oral quiz. For the quiz, I'll call you up, and ask you two or three questions about waves, amplitude, frequency, tension, period, wavelength, medium. Read over your notes from this week, and be ready. 

2. 130B: "What is a Wave?" Reading/Notes

Due Friday. 10-15min

The link to the reading is below. While reading, define the terms listed, or answer the questions I've given.

What is a Wave?

a. To introduce a wave to a slinky, what must you do to the first coil in the slinky? (hint, there are four options - list them all)

b. Define "wave" (see end of second paragraph)

c. What is the difference between a pulse and a wave?

What is a Medium?

d. Define "medium" 

e. How is the function of the wave medium (to carry the wave) similar to the function of the news media, or of a conducting piece of metal?

f. What is the medium of a stadium wave?

Particle-to Particle interaction

g. In a wave, if the first particle (in a slinky, this would be the first coil) is disturbed upwards, what would happen to the second (next) coil?

A Wave Transports Energy, not Matter

h. In the stadium wave, what happens to the particles (the fans) after the wave passes? How is this similar to a water wave?

i. "energy transport phenomenon" In a slinky wave, how does energy get transferred from the first coil to the last?

Link to reading is here ----> LINK