The Mystery of Magnets

Building Background Magnets

Vocabulary Let’s Explore Magnets & Exploring Magnetism

What do you already know about ‘magnets’? What do you want to know about ‘magnets’? Complete the KWL chart below.

Write the correct word from the Word Bank next to the definition. [ Word Bank ]

What I Know

What I Want to Know

experiment nature

What I Learned

compass machine

record uncover

1. everything in the physical world that is not controlled by humans 2. a tool with a magnetic needle that points north to determine direction 3. a scientific test done to find out how something reacts under certain conditions

nature compass experiment record

4. to write information down 5. to find out about something that has been kept secretly 6. a piece of equipment that uses power such as electricity to do a particular job

uncover machine

Write about your chart above. I know that magnets are _________________________________________

Circle the antonym of the underlined word.

____________________________________________________________________ ____________________________________________________________________ What I want to know about magnets are ___________________________________ ____________________________________________________________________ ____________________________________________________________________ 2

Four Corners Workbook

1. A magnet can also repel other magnets away from it. ① attract

② push

③ take

④ hold

2. Magnets also come in different strengths. ① power

② machine

③ equipment

④ weakness The Mystery of Magnets

3

Comprehension Let’s Explore Magnets & Exploring Magnetism (1)

Read the sentences and answer the questions.

Read the paragraph and circle the correct answer.

A ____________ is an object that has the natural power to attract certain other objects towards it. ____________ can also repel other magnets away from it. This is called magnetism.

1. What is a common word to go in the blanks? ① stone

② radio

③ magnet

④ machine

2. What is ‘magnetism’? ① ② ③ ④

magnet’s power to attract and repel certain objects the power to pull down certain objects to the center of the Earth a power to attract certain objects a power to repel certain objects away

3. What are the magnets that can be found in nature? ① rock

② lodestone

③ trains

④ track

Write the correct answer from the Word Bank.

eraser rubber band

crayon key

1. Which objects do magnets attract?

scissors, key 2. Which objects don’t magnets attract?

plastic pen cap, eraser, crayon, rubber band 3. Write about how the objects that magnets attract are alike in your own words.

They are metal objects. 4

Four Corners Workbook

Make a Magnetic Boat 1. Draw a small boat shape on the cork. Cut out the boat shape. 2. Carefully push the drawing pin into the center of the cork boat. 3. Cut out one triangular paper sail. Tape the pin to the base of the sail. 4. Turn the cork boat over so that the drawing pin points up. 5. Tape the bar magnet to one end of the ruler. 6. Set two books slightly apart on a table. Place the dish on the books. Half-fill the dish with water. 7. Float the boat in the dish. Touch the base of the bowl with the magnet at the end of the ruler. Slowly move the ruler around.

1. What will happen if you move the ruler?

[ Word Bank ] plastic pen cap scissors

Comprehension Let’s Explore Magnets & Exploring Magnetism (2)

① The boat will sink in the water. ③ The boat won’t move.

② The boat will move. ④ The boat will be broken down.

2. What makes the boat move? ① magnetism ③ gravity

② lodestone ④ cork

3. Write the materials for the experiment from the box. a sheet of cork

a coin

a shallow glass dish

a drawing pin

a bar magnet

a key

a sheet of cork, a shallow glass dish, a drawing pin, a bar magnet The Mystery of Magnets

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Vocabulary Exploring Poles & Exploring New Magnets

Complete the word puzzle.





Read the paragraph and circle the correct answer.





o l e s o b s e r v e t a o r u l e r i o i n n e e d l e t i p p g i o f s t s i m i l a r t p









Comprehension Exploring Poles (1)

Every magnet has two areas where the attraction is strongest. These areas are called poles. All magnets have a north pole and a south pole. The north pole of a magnet is attracted towards Earth’s North Pole. On a bar magnet, the poles are at opposite ends. You can use a ____________ to find the north and south poles on a bar magnet.





1. What is the paragraph about? ① poles of magnets ③ compass

2. On a bar magnet, where might the south pole of a magnet be attracted? ① toward the air ③ toward Earth’s South Pole

① telescope

Across

Down

1. the parts of a magnet where the

1. to show something by holding up one of

2. the end of something, especially something pointed 4. almost the same 6. a long flat straight objects that is used for measuring things or drawing straight lines 7. a long thin piece of metal on a scientific instrument; pointer 10. to see and notice something 6

Four Corners Workbook

② toward the center of the Earth ④ toward Earth’s North Pole

3. What word goes in the blank?

e

magnetic force is the strongest

② South pole ④ North pole

② compass

③ needle

④ ruler

Circle the correct answer.

fingers or a thin object towards it 3. facing each other 5. a strong thread made of several threads twisted together 8. to move something or someone upwards into the air 9. a small block of solid material that is longer than it is wide

1. Which is true about poles of magnets? ① Poles sometimes attract each other. ② Poles never attract each other. ③ Poles always attract each other. ④ Poles always repel each other. 2. How does compass help travelers or hikers find their way? ① ② ③ ④

Its tip always points the center of the Earth. Its tip always points west. Its tip always points north. Its tip always points east. The Mystery of Magnets

7

Comprehension Exploring Poles (2)

Read the steps of two experiments and answer the questions.

Comprehension Exploring New Magnets

Read the steps of an experiment and answer the questions.

1. Place your nail or pin near a paper clip. 2. Rub the magnet along the nail or pin. Repeat about 60 times. 3. Try picking up the paper clips with the nail or pin.

(A) 1. Place the magnets on a table with the south pole of one facing the north pole of the other. 2. Slide the magnets towards each other.

1. What are the steps for?

(B) 1. Place the magnets on a table with

① ② ③ ④

the two south poles facing each other. 2. Try to push them together.

researching when magnets repel making a magnet boat making a magnet testing magnet’s strength

2. What will happen in step 3? 1. Write what happens in experiment (A).

Two poles attract each other.

① ② ③ ④

The nail or pin can’t pick up the paper clips. The nail or pin repels the paper clips. The nail or pin points the center of the Earth. The nail or pin picks up the paper clips.

2. Write what that happens in experiment (B).

Two poles repel each other. 3. What can you know from the experiments? ① ② ③ ④

The same poles always repel each other. The same poles always attract each other. The different poles always repel each other. The different poles don’t attract each other.

4. What is the best title for the experiments? ① North or South Pole? ③ What Are Magnets? 8

Four Corners Workbook

② When Do Magnets Repel? ④ Make a Magnetic Boat

3. Which is the important caution in step 2? ① ② ③ ④

Repeat rubbing magnets more than three times. Rub the magnet in one direction only. Repeat rubbing magnets only once. Rub the magnet in many directions.

4. Write the materials for the experiment from the box. a nail

an eraser

a bar magnet

metal paper clips

a sheet of cork

a rubber band

a nail, a bar magnet, metal paper clips The Mystery of Magnets

9

Vocabulary

Magnet Fun

Comprehension Magnet Fun (1)

Fill in the blanks with the correct words to match the pictures from the Word Bank. If needed, capitalize the first letter.

Look at the picture and circle the correct answer.

[ Word Bank ] cover tape

circles small box

Magnetic Car decorate ask

A magnet is taped inside.

1. Tape one of the magnets to the inside of the

small box

_______________.

2. Cut two lengths of straw the same width as the box.

Tape

_______________ the straws on the outside of the box as shown.

draw

3. Use the compass to _______________ four circles on the cardboard. Cut out the circles.

4. Cut the toothpicks or skewers a bit wider than the box.

Ask

_______________ an adult to help you push them through

1. How can you move the car forward using another magnet? ① ② ③ ④

Hold the same pole of magnet close to the car. Hold the different pole of magnet close to the car. Break the magnet into two pieces. Attach the magnet to the roof of the car.

2. If your magnet attracts the car, how can you move the car forward? ① ② ③ ④

Break the magnet into two pieces. Put the magnet on the floor. Flip the magnet end to end so it repels. Rub the magnet along the car many times.

the straws and the centers of the wheels. 3. What nature of magnet makes the car move?

Cover

5. _______________ the ends with modeling clay to hold the wheels in place. Check that the toothpick or skewer spins freely inside the straw. 6. Cut out a top for your car from construction paper. Attach it to the box with glue or tape.

Decorate

_______________ your completed car with markers, stickers or colorful paper cut-outs. 10

Four Corners Workbook

① ② ③ ④

The different poles of magnets always repel each other. The same poles of magnets always repel each other. The different poles of magnets always attract each other. The same poles of magnets always attract each other.

4. What is the power of magnet that attracts or repels each other? ① lodestone ③ magnetism

② super natural power ④ repel The Mystery of Magnets

11

Comprehension Magnet Fun (2)

Final Test (1)

Write the number of each direction from the box to match the picture. 1.

(6)

2.

(2)

3.

(4)

1. Read the sentences. Find and write two opposite words. A magnet is an object that has the natural power to attract certain other objects towards it. A magnet can also repel other magnets away from it.

attract and repel 2. Which is true about ‘lodestone’? 4.

(3)

5.

(5)

6.

(7)

① ② ③ ④

It can be found in nature. It makes distant objects look larger and closer. Its needle always points north. It has two poles at opposite ends.

3. Write the objects that attach to magnets.

7.

(1)

a rubber band

an eraser

scissors

paper clips

nails

glue

scissors, paper clips, nails 4. How are the objects that attach to magnets alike? (1) Place all the sea catches in the box. (2) Write a number between one and ten on one side of each fish or creature. (3) Slide one paper clip onto each cut-out. (4) Cut out five small ‘unwanted catches’, like old boots or clumps of seaweed. (5) Cut one 20-centimeter piece of string. Tie one end of the string to the ruler and the other end to the magnet. (6) Cut out ten to fifteen small fish and sea creature shapes from the construction paper. (7) Use markers, stickers or colorful paper cut-outs to decorate the outside of the cardboard box like an underwater scene. 12

Four Corners Workbook

① They are made with plastics. ③ They are made with rubber.

② They are made with iron or steel. ④ They are made with oil.

5. What are two areas of magnet where the attraction is the strongest? ① North Pole ③ telescope

② gravity ④ poles

6. Write why a compass should not be held near a magnet when it is being read.

Because the magnet can affect reading a compass. The Mystery of Magnets

13

Grammar Imperatives (1)

Final Test (2)

1. Imagine that two magnets are placed on a table as facing two poles with the combinations in the chart. Mark( ) on the correct results in the chart.

Change the sentences into positive imperatives. Example

Magnetic Combination

Repel?

Attract?

north-south

You must close the door now. → Close the door now.

1. You must drink a lot of water while exercising.



Drink a lot of water while exercising.

south-north north-north south-south

2. You must take an umbrella with you when it is cloudy.



Take an umbrella with you when it is cloudy.

3. Let’s clean the house before the visitors arrive.

→ 2. Write about the nature of magnet from the chart above in your own words.

The same poles of magnets always repel each other. And the different poles of magnets always attract each other. 3. How can you change a steel object into a magnet? ① ② ③ ④

breaking the object into pieces rubbing magnet along the object many times heating the object for a long time freezing the object for a long time

Clean the house before the visitors arrive.

4. Let’s make a cake to celebrate a New Year.



Make a cake to celebrate a New year.

Change the sentences into negative imperatives. Example

Sit on this chair. → Don’t sit on this chair.

1. Stand near the window.



Don’t stand near the window.

2. Go to Pete’s house on Sunday. 4. Reread Book page 13 and write about a compass and how it helps to find a way.

The needle in a compass is a magnet. And its tip points north. So travellers, hikers, pilots or sailors use it to find their way.



3. Decorate your box before the water color is dried.



Four Corners Workbook

Don’t decorate your box before the water color is dried.

4. Drink my lemonade on the table.

→ 14

Don’t go to Pete’s house on Sunday.

Don’t drink my lemonade on the table. The Mystery of Magnets

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Grammar Imperatives (2)

Writing Magnet Fun

Circle the correct verbs to complete imperative sentences.

Do you have any ideas about having fun with magnets? Write about the steps for a magnetic game using imperative sentences. If needed, draw pictures.

1. (Cut Lift) the magnet by the string. Tape the string to the edge of a table or desk so that it hangs in midair.

Materials:

2. (Cut Choose) another player for the timekeeper. 3. (Move Use) your compass to find north. Place a pencil or ruler on the table pointing north. 4. Move the magnet slightly. (Wait Use) until the magnet is still. Observe which end of the magnet points north.

Steps: 1. Fill in the blanks with the correct verb to complete each sentence. If necessary, capitalize the first letter.

2.

[ Word Bank ] make

look

rub

float

3. 1.

Rub

the magnet along the nail or pin. Repeat about 60 times.

2. Once the magnet is still,

look

at the direction it is facing. Which end of the bar

4.

magnet points north? 3.

Float

the boat in the dish. Touch the base of the bowl with the magnet at the end of

the ruler. 4. On a sheet of paper,

16

Four Corners Workbook

make

5.

a chart and record the objects that the magnet attracts.

The Mystery of Magnets

17

Listening Practice

MEMO

Listen to the sentence and fill in the blanks.

repel other magnets away from it. 1. A magnet can also __________ objects some objects and not others. 2. Magnets __________ needle in a compass is a magnet. 3. The __________ attraction is __________. strongest 4. Every magnet has two areas where the __________ turns at clockwise until each player has had three __________ 5. Go around the circle __________ fishing.

Listen to the paragraph and fill in the blanks.

machines make many kinds of magnets. 6. Magnets are everywhere. People and __________ dryers These can be seen at work in such things as televisions, hair __________, high speed trains and radios. Other magnets, such as lodestone, can be __________-__________ nature found in __________. attach horseshoe magnet over each object. Observe which objects __________ 7. Lower the __________ Sort the objects into two piles. themselves to the magnet and which do not. __________ north pole and a south __________. pole The north pole of a 8. All magnets have a __________ attracted towards __________ Earth’s North Pole. On a __________ bar magnet, magnet is __________ ends You can use a __________ compass to find the north and the poles are at opposite __________. south poles on a bar magnet. still 9. Once the magnet is __________, look at the direction it is facing. Which end of the bar north Paint the end that points south __________. blue Move the magnet points __________? stay magnet __________. Wait until the magnet is still. Observe which end of the magnet slightly north. Repeat this step several times. __________ catches like old boots or clumps of __________. seaweed 10. Cut out five small ‘unwanted __________’, Miss a turn!’ or ‘Got __________!’ away Write messages, such as ‘__________ on one side of each shape. 18

Four Corners Workbook

The Mystery of Magnets

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Four Corners WORKBOOK

The Mystery of Magnets Publisher Jae-yoon Chung Managing Director Hannah Lee Senior Editor Jung-ah Kim Project Editor Reese Ji Written by Jeong Hee Choi Proofread by Alwin G. Fontenot Recorded by Yeasung Media Tech Illustrated by Donghyun Lee, Youngjoo Jung Designed by DOD Design Printed by POD KOREA Copyright © 2008 by Language World Co., Ltd. All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written consent of Language World Co., Ltd., including, but not limited to, in any network or other electronic storage or transmission, or broadcast for distance learning.

www.lwbooks.co.kr First Edition in 2008 ISBN 978-89-256-0033-8