Your Name_________________________________________Period_________Teacher_________________________Today’s Date___________________________

Energy

This packet will be practice in the following 8th Grade Standards:

I can explain what energy is and how it is transferred, transformed, and conserve

Name ____________________________________________________________________ Period

Energy Unit VocabularyUnit Vocabulary List – Keep track of all of the unit’s vocabulary words as we go. For each

word, include a definition and a sketch.

Term Definition Sketch

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Term Definition Sketch

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Tennis Ball Bounce

Procedure:

1. Predict how high your tennis ball (or orange bouncy balls) will bounce when you drop it from 50 and 100 cm

2. Tape a meter stick to the wall with the zero end on the ground 3. Drop a tennis ball from the 50 cm mark, film it on your camera

phone using the SloPro app Record the height to which the ball bounces

4. Repeat step 5 2 more times, recording the height the ball reaches each time.

5. Repeat steps 3 and 4 at 75 cm, and then again at 100 cm.6. IF TIME: try dropping another type of ball from the 50, 75, and 100 cm mark. Record in the

blank space in your table.

Height dropped

Predicted bounce height(cm)

1st bounce (cm)

2nd bounce (cm)

3rd reading (cm)

Average bounce height(cm)

50 cm

75 cm

100 cm

ON A SEPARATE PIECE OF GRAPH PAPER: 1. Make a scatter plot of height dropped versus height reached on bounce. 2. On the back of your scatter plot, answer the following questions:

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1. What happened to the ball on each bounce? 2. Can you use energy to explain why this happened?

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Reading Notes: The Nature of Energy (pages 140 – 145)Use the Cornell notes template to write down key ideas from the text: Summarize each paragraph in one or two sentences, being sure to include any key terminology.

Essential Question ___________________________________________________________________________________________________________________________________________________________________________________________________________

Main Ideas Supporting Details

1. What is Energy

2. Kinetic Energy

3. Mass and Velocity

4. Calculating Kinetic Energy

There will be an open-notes over this material on _______________!

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Supporting Details

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Kinetic energyE

E

Potential Energy

__

__

__

fi

fu

__

Ele

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__ctromagnetic Energy=

__

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1.

In the picture on the right, the roller coaster car

isn’t moving at Point W. What kind of energy

does it have? ________________________

2. Now, the roller coaster starts and the car goes

forward. What two types of energy does it

have at Point Y?

________________________ ________________________

3. At what point does the roller coaster car have the most kinetic energy? ____

I know this because…

4. The picture on the right shows a circuit. What kind of

energy is stored in the battery? ____________________

5. When the switch is turned on, what kind of energy is

moving through the circuit? ________________________at types of

energy are the bulbs putting out? ________________________

________________________

6. Bungee jumpers jump off of high places with a stretchy cord tied around their feet. The picture on the

right shows a bungee jumper right after he has jumped. As he falls,

what kind of energy does the bungee jumper have?

____________________

7. Before he jumped , what kind of energy did the bungee jumper have?

____________________

8. As the jumper falls, the bungee cord stretches. When the jumper reaches

his lowest point before he starts moving back up, what kind of energy

does this show?

____________________

9. What type of energy is the Sun in the background giving off?

Reading Notes: The Nature of Energy (pages 148 – 153)

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Use the Cornell notes template to write down key ideas from the text: Summarize each paragraph in one or two sentences, being sure to include any key terminology. There will be an open-notes over this material on _______________!

Essential Question ___________________________________________________________________________________________________________________________________________________________________________________________________________

Main Ideas Supporting Details1. Conversions

Between Forms of Energy

2. Kinetic and Potential Energy

2. Kinetic and Potential Energy

a. Energy Conversion in Juggling

b. Energy Conversion in a Waterfall

c. Energy Conversion in a Pole Vault

d. Energy Conversion in a Pendulum

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3.C

4.E

5.E

6.C

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Name: Class: Date:

Soaring Straws: Experimenting with Energy Conversions

Background: In this experiment you will learn about energy and how it can be converted. In case you don’t recall, energy is the ability to do work or cause change. A bulldozer has energy because it can do work (move large piles of dirt) and a flashlight has energy because it can cause change (brighten a dark room). There are 2 main types of energy. Kinetic energy is the energy of motion. Anything that is moving has kinetic energy. Potential energy on the other hand is stored energy. It is held and has the potential to do work but not until it is released. When a rock is placed in the pouch of a slingshot and the band is stretched far back, it gains elastic potential energy. The band has lots of energy but all of it is stored. As soon as it is released, the rock will go sailing through the air. The elastic potential energy from the slingshot gets converted to kinetic energy in the moving rock. This is an important concept to remember about energy. It can be transferred, or passed from one object to another. It can also be converted, or changed from one type of energy into another.

Can the kinetic energy of the

rock be converted back into potential energy? It can if the rock is shot straight up in the air. As the rock goes higher, it slows down showing that it is losing its kinetic energy. But the energy doesn’t actually get lost. Instead, its kinetic energy is being converted into a different kind of energy called gravitational potential energy. This kind of energy has to do with how high an object is above the ground. Anything that can fall will have gravitational potential energy. This energy is stored until the object actually does fall.

Once the rock has gone as high as it will go, all of its kinetic energy will have been converted into gravitational potential energy. So what happens to its energy next? Well, if the rock were to land on a cliff and stay up above the ground, the energy would stay stored as gravitational potential energy. But if the rock begins to fall back down, the gravitational potential energy that it gained gets converted right back into kinetic energy.

Data Collection:

Partner Name(s):

elastic potential energy(stretched slingshot band)

kinetic energy(rock flying through air)

kinetic energy(rock shooting straight up)

gravitational potential energy(rock gains height)

gravitational potential energy(rock is high above the ground)

kinetic energy(rock falls back down)

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Analysis and Conclusion Questions:

1. What is energy? 2. Look at your results. How is the amount of stretch related to the height of the rocket?

3. 3 different types of energy were present as you conducted this experiment. What were they and give an example of when each was present.

4. There ere four times that energy was converted in this experiment. See how many you can identify using the organizer below:

was converted into

when…

was converted into

when…

was converted into

when…

was converted into

when…

Part A. Try it together Identify all the energy types that are being demonstrated in the picture on the right (ignore friction):

Energy type Shown by

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Now, explain how the energy flows from the hamster to the lightbulb.Step 1. The hamster’s _____________________ energy gets changed into _____________________ energy and flows through the _____________________.Step 2: ______________________________________________________________________________________________________________________________________________________________________________________________Step 3 (this is where the energy leaves the system):_________________________________________________________________________________________________________________________________________________________- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The picture below shows a simple food chain. What types of energy does this show? (Hint: Think about the daily activities of the animals. Also, birds are warm-blooded – the other living things are not.)

Energy type Shown by

Where is this system getting its energy (not shown)? ___________________________

Step 1:

The picture on the right shows a special type of aquarium that is completely sealed. This particular aquarium has been sealed for five years and contains a shrimp (an animal) and algae (tiny plants).

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There is only one source putting energy into this system. What is it? (Hint: Think about the plants.)

There is only one kind of energy leaving this system. What is it?

What types of energy are shown in the system, and where are they shown? (You should find at least four. Do a table like the one in the first example.)

Now, explain how the energy flows into the system, what it does while inside the system, and how it gets back out.

Part B. Scenarios. Jeffrey eats an energy bar before a game. He runs a lot during the game and feels very hot afterwards.

a. What three types of energy are shown in this short scenario?

b. Explain (OR DRAW) step by step how the energy flows, starting right before Jeffrey ate the energy bar.

2. Nahomy dropped her house key into a sink by accident. She holds a powerful magnet over the sink to try to get them back. The keys make a loud noise as they move up the pipe toward the magnet.a. What three types of energy are shown in this short scenario?

b. Explain (OR DRAW AND LABEL) step by step how the energy flows, starting right as Nahomy puts the magnet over the sink.

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3. ON A SEPARATE SHEET OF PAPER A. Write your own energy flow scenario. B. List the types of energy involvedC. Explain (OR DRAW AND LABED. L) step by step how the energy flows through your scenario

Notes

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Notes

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