Invisible Tug ReadingThe Invisible Tug Name: ____________________________________ Date: _____________________________________ 1 Have you ever tried to pull two pieces of metal together, but felt a strange force pushing your hands apart? This is not magic. It is the power of magnets! Magnets create an invisible force all around them. We cannot see this force, but we can see what it does. It helps hold notes on a fridge and even helps move fast trains! 2 Every magnet has two ends called poles. There is a north pole and a south pole. The rules for magnets are very simple. If you put two north poles together, they will push away from each other. But if you put a north pole near a south pole, they will snap together! This is why people say "opposites attract." 3 The magnetic force is strongest at the ends of the magnet. If you put tiny bits of metal around a magnet, they will show you the shape of the force. The bits form curved lines that loop from one pole to the other. This invisible tug can even travel through paper, plastic, and water! 4 People first found magnets a long time ago. They found a special kind of rock called lodestone. These rocks were natural magnets. They could pull small bits of iron toward them. At first, people just used these rocks for fun or to show tricks. They did not know that these rocks would change the world. 5 Later, people learned how to use magnets to find their way. They made a tool called a compass. If you float a small piece of lodestone on water, it always points north. This helped sailors travel across the big ocean without getting lost. Because of the compass, people could visit new lands and trade with each other. 6 Why is a magnet so strong? It is because of how the tiny parts inside it are aligned. In most things, these tiny parts point in all different directions. But in a magnet, the parts are all aligned. This means they are all lined up in a straight, neat row. This makes the magnet very powerful. 7 Today, we use magnets in many ways. Doctors use giant magnets to look inside the human body. These machines help doctors see if people are healthy. Huge magnets are also used at junk yards to pick up heavy metal. They are even inside our computers! Thanks to early discoveries, magnets have changed our world. Science Reader Series • Grade 3 Level
Invisible Tug Quiz Page 1The Invisible Tug Quiz Name: ____________________________________ 1. According to the text, how did the compass help sailors long ago? A. It helped them see inside the human body. B. It allowed them to travel across the ocean without getting lost. C. It made the water move in curved lines around the boat. D. It turned regular rocks into lodestones. Part A 2. Look at paragraphs 4 and 5. How does the author connect these two parts of the text? A. By showing how magnets were used first for fun and then as a tool. B. By explaining why paper and plastic cannot stop a magnet. C. By comparing the size of a lodestone to the size of a compass. D. By telling a story about a sailor who found a lodestone. Part B 3. Which sentence from the text best supports the answer in Part A? A. "These rocks were natural magnets." (paragraph 4) B. "They could pull small bits of iron toward them." (paragraph 4) C. "At first, people just used these rocks for fun..." (paragraph 4) D. "Later, people learned how to use magnets to find their way." (paragraph 5) 4. The author says magnets are used to help doctors. Select two sentences from paragraph 7 that best support this idea. A Today, we use magnets in many ways. B Doctors use giant magnets to look inside the human body. C These machines help doctors see if people are healthy. D Huge magnets are also used at junk yards to pick up heavy metal. E They are even inside our computers!
Invisible Tug Quiz Page 2Page 2 The Invisible Tug Quiz Name: ____________________________________ 5. What does the author want you to know about magnets? A. Magnets are only useful for sailors and doctors. B. Lodestone is the only kind of rock that is fun to play with. C. Magnets are amazing tools that help us in many parts of our lives. D. We should stop using magnets because they are invisible. 6. In paragraph 6, what does the word aligned mean? A. broken apart B. lined up C. hidden away D. floating on water 7. How has the way people use magnets changed from the past to today? Use details from the text to explain your answer.
Invisible Tug Answer KeyAnswer Key (3rd Grade) Teacher Resource • The Invisible Tug Master Copy B Found in paragraph 5: "This helped sailors travel across the big ocean without getting lost." A (Part A) Para 4 mentions using rocks for fun/tricks. Para 5 mentions the compass as a survival tool. D (Part B) This sentence shows the shift to using magnets for a specific purpose (finding their way). Options 2 & 3 Sentences: "Doctors use giant magnets..." and "These machines help doctors see if people are healthy." C The text explains many ways magnets are "an important part of our world." B The text explicitly states: "This means they are all lined up in a straight, neat row." Short Response Guide Answers should mention that in the past, people used magnets for tricks or fun (lodestones). Today, we use them for important tools like the compass, MRI machines for doctors, or computers.
Magnetic Forces Teacher GuideTeacher Guide: Magnetic Forces Grade 3 • Science & ELA Lesson Overview This lesson introduces 3rd-grade students to magnetism through a reading passage and a standardized-style quiz. Students will explore the history of magnets, the mechanics of magnetic poles, and modern uses. Lesson Components • Reading: The Invisible Tug • 2-Page Assessment • Student Answer Key Learning Targets Science "I can describe how magnets have two poles and explain how they have been used as tools." ELA / Reading "I can use details from a text to explain how magnets work and find the meaning of words." Discussion Prompts 1 Predict: Before reading, ask: "If I put two magnets together, what are the two things that might happen?" 2 Impact: "Why was the compass such an important tool for sailors long ago? How did it change where they could travel?" 3 Scientific Inquiry: "If a magnet lost its strength, what do you think happened to the tiny parts (atoms) inside it?" Extension Activity Hands-On: Mapping the Invisible Give students bar magnets and small containers of iron filings. Have them place the magnet under a piece of paper and slowly sprinkle the filings on top. Objective: Students will visually verify the "curved lines" described in Paragraph 3. Science Curriculum Resources • Teacher Support Material
Invisible Tug Jot SheetThe Invisible Tug Jot Sheet Note-taking Part 1 • Grade 3 Reading Name: ____________________________________ Date: _____________________________________ Directions: Write the most important details for your assigned paragraph. When it's time for your team to share, listen and jot down their ideas. Use the lines to help your handwriting! 1 Paragraph 1 2 Paragraph 2 3 Paragraph 3 Turn page for Paragraphs 4-7 Page 2 The Invisible Tug Jot Sheet Name: _______________________________ 4 Paragraph 4 5 Paragraph 5 6 Paragraph 6 7 Paragraph 7 What is the most amazing thing you learned about magnets from this reading? Scientific Inquiry Series • 3rd Grade
