PART 1 Class Agenda TODAY’s PLAN: Today’s TaSK: EQ: How much energy can a rock store? LT: Obtain and evaluate information for the effects of adding energy to rocks. SC: Prepare for the Earthquake Machine Lab. Work with table partners for the investigation.

Easy to change its shape What words do you think of when you hear the term “Elastic?” Make a concept map with “Elastic” as the topic word… Here’s what others mentioned… Stretchy Flexible Bendable Easy to change its shape What does Elastic mean?

TYPES OF ENERGY & EARTHQUAKE TERMS Look up one following words… *POTENTIAL ENERGY *KINETIC ENERGY *STRESS *FRICTION *BRITTLE *DUCTILE *EXTENSSION *COMPRESSION Which words have a relationship? Which have opposite meaning?

How are the words “Brittle” and “Ductile” different? If we made a spectrum with “Brittle” on one end and “Ductile” on the other, we could call it the “Elastic Energy Spectrum.” Where would you place the following items if you were to consider their “Elastic Potential,” meaning how much energy can they take on and store before they reach the “Elastic Limit” and break? BRITTLE (Elastic Potential Energy) DUCTILE Rubber band Wood ruler Pencil Paper clip Glass Gum Plastic ruler Marble tile Rocks

Are rocks Elastic? Class Discussion Can you bend a rock? Why/why not? What if another rock was pushing on it, what might happen? Who thinks rocks are elastic? What evidence do you have? Let’s play with a model… We’ll call it “Earthquake Machine” (Demonstrate & have students answer on their worksheet) How can we modify the model so that earthquakes no longer occur? How can we modify the model to make bigger earthquakes? What is elastic in the earth that can store energy?

WhaT EVIDENCE DO YOU NEED TO CHANGE YOUR MIND that rocks can be elastic? Describe common everyday objects that bend (ELASTIC), then break (BRITTLE)? List examples on your worksheet: (Question 4) (RUBBER BAND DEMO) (MARBLE TONG DEMO)

COMPLETE MIDDLE CHECK HOW ARE YOU FEELING ABOUT YOUR SUCCESS CRITERIA? HOW IS YOUR TABLE PARTNER DOING? RAISE YOUR HAND IF YOU HAVE QUESTIONS.

Answer WORKSHEET Questions 5-7 as a team before proceeding When we are pushing against an object we are adding energy where we are in contact with the object. . That energy is absorbed by the object and can be stored by the object as “Potential Energy” waiting to be used. Examples: Gasoline in a car not running, An apple waiting to be eaten Eventually matter can only absorb so much energy before it meets its “limit.” Q5. How much stress must build up in a pencil before it stops bending and breaks? Q6. How much stress can a rubber band store before it breaks? Q7. How is a pencil different than a rubber band? How are they both different compared to a rock?

how much added “STRESS” iS required to form these changes: TABLE TALK: Which is an example of Brittle Rock & which is an example of Ductile rocks? (Draw on your worksheet & Explain)

EXIT TICKET: COMPLETE YOUR END CHECK

OPTIONAL EXTENSION: STUDY & REVIEW Watch the following video and answer these questions: https://www.youtube.com/watch?v=tw3q4_jZv8M Start video at 5:23 & Watch to the end (NOTICE THE TV & EGG) Describe the elastic energy of skin. Explain why a rock has more elastic energy than an egg. Explain why balloons and bubble gum pops. Describe how this relates to plate tectonics.