Lesson By Lesson Guide Magnetism & Electricity (FOSS Kit) Magnetism & Electricity Page 1 Table of Contents NC Essential Standards and Clarifying Objectives ........................................................................ 3 Essential Question for Unit ............................................................................................................. 3 Unit Pre-Assessment ....................................................................................................................... 3 Preparing for the Unit ..................................................................................................................... 3 Lesson 1 - Investigation 1, Part 1: Investigating Magnets and Materials ....................................... 5 Lesson 2 - Investigation 1, Part 2: Investigating More Magnetic Properties................................. 7 Lesson 3 - Investigation 1 Part 3: Breaking the Force ................................................................... 9 Lesson 4 - Investigation 1, Part 4: Detecting the Force of Magnetism......................................... 11 Lesson 5 - Investigation 2, Part 1: Lighting a Bulb ..................................................................... 13 Lesson 6 - Investigation 2 Part 2: Making A Motor Run ............................................................. 15 Lesson 7 - Investigation 2, Part 3: Finding Insulators and Conductors ........................................ 17 Lesson 8 - Investigation 2, Part 4: Investigating Mystery Circuits............................................... 19 Lesson 9 - Investigation 3, Part 1: Building Series and Parallel Circuits ..................................... 21 Lesson 10 - Investigation 3, Part 2: Building Parallel Circuits..................................................... 23 Lesson 11 - Investigation 3, Part 3: Solving the String of Lights Problem .................................. 25 Lesson 12 - Investigation 4, Part 1: Building an Electromagnet .................................................. 27 Lesson 13 - Investigation 4, Part 2: Changing Number of Winds ................................................ 29 Lesson 14 - Investigation 4, Part 3: Investigating More Electromagnets ..................................... 32 Lesson 15 - Investigation 5, Part 1: Reinventing the Telegraph ................................................... 34 Lesson 16 - Investigation 5, Part 2: Sending Messages Long Distance ....................................... 36 Magnetism & Electricity Page 2 NC Essential Standards and Clarifying Objectives 4.P.1 Explain how various forces affect the motion of an object. 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2 Understand the composition and properties of matter before and after they undergo a change or interaction. 4.P.2.1 Compare the physical properties of samples of matter: strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.* 4.P.3 Recognize that energy takes various forms that may be grouped based on their interaction with matter. 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change. 4.P.3.2 Recognize that light travels in a straight line until it strikes an object or travels from one medium to another, and that light can be reflected, refracted, and absorbed. *In this unit, the emphasis is on conductors, nonconductors (insulators), and the ability to be attracted by magnets. Essential Question for Unit How do electricity and magnetism work, and how can they work together? Unit Pre-Assessment Two formative assessment probes are available for this unit. “Magnets in Water” can be found on page 67 of Uncovering Student Ideas in Science, 25 Formative Assessment Probes Volume 4 (Green Cover), by Page Keeley et al. This probe elicits students’ ideas about magnetism, specifically if students think air is required for magnets to work. Another probe called “Batteries, Bulbs, and Wires” is available on page 57 of Uncovering Student Ideas in Science Volume 3 (Green Cover), by Page Keeley et al. This probe reveals whether students recognize the pathway of electricity in a complete circuit. “Magnets in Water” can be administered at the beginning of the unit because Investigation 1 is an exploration of magnets and magnetism. “Batteries, Bulbs, and Wires” can be administered at the beginning of Lesson 5 (Investigation 2, part 1- Lighting a Bulb). Preparing for the Unit Make sure the D-cells and bulbs in the kit are fresh; may need to replace mid-unit Make copies of assessment charts in teacher guide Magnetism & Electricity Page 3 Make copies of duplication masters needed for investigations Collect books related to topic Copy the activity one handouts for students and decide how you will use them with science notebooks Check the wires in the kit to see if cutting and stripping ends of insulated wire is needed Magnetism & Electricity Page 4 Lesson 1 - Investigation 1, Part 1: Investigating Magnets and Materials Students find objects that contain iron stick to permanent magnets while other objects do not. They discover that two magnets will either attract or repel one another, depending on the orientation of their poles. The agent responsible for this behavior is the magnetic force. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) Focus Question(s) How do magnets interact with each other and other objects? Activity Administer the “Magnets in Water” formative assessment probe. Following the formative assessment probe, engage students in a game called “Describe the Object.” Place an object in a bag and invite a student to reach in the bag to describe the characteristics (size, shape, feel, etc) of the object while the rest of the class is challenged to draw what they think the object looks like. Ask students to describe other magnets they have seen or played with. Invite students to experiment with magnets at their seats, around the classroom, and in groups. (Discuss areas that students should avoid such as where you have audio or videotapes, calculators, or computers as the magnets can "erase" the information.) Lead a discussion so students share the results of things-that-stick. Introduce the bag of test objects. Lead a discussion of the results of the things-that-stick and things-that-don't stick sort. Introduce attract and repel. Discuss magnets on a pencil to introduce force. Begin a word wall of key vocabulary Magnetism & Electricity Guiding Questions Is there something that is the same about all the objects that the magnet sticks to? Were you surprised by any of the objects you tested? Is there anything you notice that is the same about all of the things listed in the column for things-that-stick? Are any metals in the things-that-don'tstick column? What do you think is different about the metal items in the first column compared to those in the second column? How could you use a magnet as an iron and steel detector? Were there any objects you thought might be iron, but were not? Did you find any steel that was hidden by paint or something else? How do you know? What did it feel like to push repelling magnets together? What do you think is causing the magnets to push apart/repel? Can you think of a general rule about what magnets stick to? What happens when two magnets come together? Page 5 and a content/inquiry chart. Schedule a time to share Magnus Gets Stuck from the FOSS Science Stories see the Science Stories folio in the Teacher Guide for more information. What is a force? Science Content Words Use these terms when teaching the lesson: To pull toward one another, as opposite poles of two magnets pull toward one attract another A push or a pull force The influence of a permanent magnet's magnetic field on a piece of iron, induced which makes the iron act like a magnet magnetism A form of the mineral magnetite that is naturally magnetic or has become lodestone magnetized (from FOSS Science Stories) An object that sticks to iron magnet A property of certain kinds of materials that causes them to attract iron or magnetism steel To push away, as similar poles of two magnets push away from one another repel A piece of iron that behaves like a magnet when it is touching a permanent temporary magnet magnet Integration Hints - PE/Dance: Demonstrate attract (get close to each other) and repel (run far from each other). - Provide magnets and test items for students to explore in a center; students should record their findings on a graphic organizer, such as a T-chart - Math: Graph or tally the number of objects that were attracted to the magnet or repelled by it. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Assessment Opportunities The formative assessment probe is an assessment opportunity. Magnetism & Electricity Page 6 Lesson 2 - Investigation 1, Part 2: Investigating More Magnetic Properties Students observe that steel objects in contact with a magnet become a temporarily magnetic themselves. This induced magnetism disappears when the steel object separates from the magnet. Students find out that the magnetic force acts right through materials, with the exception of iron. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) Focus Question(s) How do magnets interact with each other and other objects? Activity Invite students to recall what they learned about magnets in part 1 and propose more exploration of magnetism. Visit student groups as they explore how magnets and iron objects work together and investigate the force of magnetism through various objects. Lead a brief discussion for students to share their discoveries. As students continue to explore, use guiding questions to take the investigation further. Discuss magnetism through materials; introduce induced magnetism and temporary magnet. Continue to make word wall and content/inquiry entries. Guiding Questions Can you "chain" objects from the magnet? Can a steel nail stuck to a magnet pick up a paper clip? Can a magnet attract a paper clip through a piece of paper or through a piece of foil? Does an iron object have to touch a magnet to become a temporary magnet? What happens when you touch a piece of iron to a permanent magnet? Is the force of magnetism stopped by any materials? How do you know? How does distance affect the ability of a magnet to attract a piece of iron? Science Content Words Use these terms when teaching the lesson: To pull toward one another, as opposite poles of two magnets pull toward one attract another A push or a pull force The influence of a permanent magnet's magnetic field on a piece of iron, induced which makes the iron act like a magnet magnetism A form of the mineral magnetite that is naturally magnetic or has become lodestone Magnetism & Electricity Page 7 magnet magnetism repel temporary magnet magnetized (from FOSS Science Stories) An object that sticks to iron A property of certain kinds of materials that causes them to attract iron or steel To push away, as similar poles of two magnets push away from one another A piece of iron that behaves like a magnet when it is touching a permanent magnet Integration Hints - Math: Graph or tally the number of items that were attracted or repelled by the magnet. - PE/Dance: Demonstrate attract (get close to each other) and repel (run far from each other) Science Notebook Helper - Duplication master can easily be adapted to the observations section of your science notebooks. Students list items under headings “stick” and “does not stick” Assessment Opportunities - A performance assessment is provided in the FOSS assessment section of the teacher guide. Just do part one. - Pictorial assessment for students to write about how magnets can attract or repel. Magnetism & Electricity Page 8 Lesson 3 - Investigation 1 Part 3: Breaking the Force Students use a balance and large washers to measure the force of attraction between two magnets. They systematically investigate what happens to the force of attraction as the distance between the two magnets increases. Students graph their results and participate in a teacher-led discussion to make sense of the data. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) Focus Question(s) How much force does it take to pull to magnets apart? Activity Tell students that asking questions about things they have seen or experienced and trying to set up investigations to answer those questions are both important aspects of science. Introduce the equipment for the investigation. Once materials are distributed, visit the groups to monitor progress. Offer hints if a group is stalled or ask a successful group to share its method for determining how much force is needed to pull the magnets apart. Propose a standard investigation and refine the technique so everyone can work on the problem the same way. After sharing group results, discuss the importance of all groups following a standard procedure when conducting a scientific investigation. Introduce and distribute spacers. Model the creation of a graphic organizer for students to track the number of spacers and the number of washers. Prepare students to make a prediction by omitting the test with two spacers. Guide students to record data on a graph and make predictions using the Magnetism & Electricity Guiding Questions How can the strength of the force of attraction between two magnets be measured? From earlier observations, we thought that the force of attraction didn't work if the magnets were too far apart. How could we be sure that that observation is true? Does it make a difference where you place the washers in a cup? Does it make a difference how you place the washers in a cup? At random or stacked? Does it matter if you drop the washers into the cup? What do you think will happen to the force of attraction between two magnets if you put a plastic spacer between two attracting magnets? Do you think the force will get stronger, weaker, or stay the same? How many washers did it take to break the force with two spacers? How many spacers were used when it took four washers to break the force? How can you use a graph to predict? What happens to the strength of attraction between two magnets as the distance between them increases? Page 9 graph. Make new word wall and content/inquiry entries. Science Content Words Use these terms when teaching the lesson: An instrument that uses a freely moving magnetic needle to indicate compass direction (from FOSS Science Stories) Something that helps you identify or locate something detector Something that organizes data visually to show a relationship between two things graph intersection The point at which two lines cross Either of two opposing forces or parts, such as the poles of a magnet (from FOSS pole Science Stories) prediction An educated guess based on data or previous experience Integration Hints - Math: Find ranges for the data, graphing - Science Center: Make a compass (details in teacher guide) - Art: Magnetic art with iron filings in a closed zip bag (details in teacher guide) Science Notebook Helper Staple or paste “The Force” worksheet into science notebook. Students should record how the magnetic force was decreasing as spacers were added. Encourage students to use the vocabulary attract, force, iron, magnet and repel in their notebooks for activity one. Assessment Opportunities - Performance assessment in the assessment section of the teacher guide; do part two. - Students should be able to explain that the force of attraction between two magnets decreased as the distance between the two magnets increased. Magnetism & Electricity Page 10 Lesson 4 - Investigation 1, Part 4: Detecting the Force of Magnetism Students explore ways to detect the magnetic force. They find several ways to detect the force and to make it visible, using items such as compasses and iron fillings. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) Focus Question(s) How can we detect magnetic fields? Activity Refer to the content/inquiry chart to review concepts students have learned about magnets. Introduce one of the magnet boxes, telling students that a magnet is taped somewhere inside and prompt students to think of a way to find the magnet without looking inside. Describe the preparation of the magnet boxes and allow groups to practice the detecting process. Collect the magnet boxes, seal them with transparent tape, and redistribute the magnet boxes so teams get one that is not their own. Visit groups as they detect and pose questions to check student understanding. Lead a discussion for students to share which material was the best detector and why. Schedule a time to share How Magnets Interact and Make a Compass from the FOSS Science Stories -see the Science Stories folio in the Teacher Guide for more information. Guiding Questions Can you figure out where two magnets are taped in a box without looking inside? Why do you think the filings work like this? Do you think the compass has iron in it? Why do you think so? How did the compass help you locate the magnet in the box? How did you record your observations? How did you use the information you collected with the compass? Since you can't see the force of a magnet, how can you tell there is one present? Science Content Words Use these terms when teaching the lesson: An instrument that uses a freely moving magnetic needle to indicate compass direction (from FOSS Science Stories) Something that helps you identify or locate something detector Magnetism & Electricity Page 11 Something that organizes data visually to show a relationship between two things graph intersection The point at which two lines cross Either of two opposing forces or parts, such as the poles of a magnet (from FOSS pole Science Stories) prediction An educated guess based on data or previous experience Integration Hints - Use the science stories from the kit “How Magnets Interact” and “Make a Compass?” in science or literacy centers. - Have students write a “how-to” piece on how to find magnets using the magnet detector of their choice. - Place hidden magnet boxes and magnet detectors in a center for further exploration. Science Notebook Helper - Have students record drawings of their predictions of magnet placement in the magnet boxes. - After the class discussion, have students write about what they observed from their magnet detectors (ex: compass spinning, iron filings standing up on end) and how their observations helped them find the hidden magnets. Assessment Opportunities - Informal notes from group visits/ class discussion - Science Notebook paragraphs about their observations of magnet detectors to find the location of hidden magnets. Magnetism & Electricity Page 12 Lesson 5 - Investigation 2, Part 1: Lighting a Bulb Students explore simple electric circuits. They use trial and error to build a circuit that lights a bulb. They begin developing concepts about how connections must be made and how electricity flows through a circuit. *NOTE: Be sure to share with students that wall sockets/outlets have dangerous levels of electric energy and nothing will be placed into wall sockets/outlets at anytime! Clarifying Objectives 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change. Focus Question(s) Using a bulb, wire and battery, how can we turn on a light bulb? Activity Hold up a D-cell and ask students if they recognize it and know what it's used for. Then introduce the light bulb and propose making it light. Administer the “Batteries, Bulbs, and Wires” formative assessment probe. Introduce the focus question and have students predict using prior knowledge. Let students explore ways of lighting the bulb with the materials. Have students record their attempts in their science notebook. Discuss methods of lighting the bulb with the group. Label the parts of circuit components using science content words. Introduce the bulb and cell holders. Point out the filament and give students the opportunity to identify and study it. Lead a discussion for students to share their ways to light the bulb. Make entries to the word wall and content/inquiry chart. Guiding Questions Can you use a battery to turn on the light bulb? Where did you connect the wires to the battery? Where did you connect the wires to the light bulb? What happens when you touch the wire to the glass part of the bulb? Can you light a light bulb with just one wire and a battery? You can't see electricity. How do you know when it is flowing in a bulb circuit? How many wires connect to the battery/light bulb, and where do they connect to make a complete circuit? How did you get the bulb to light with only one wire? What components are needed to make a complete circuit? What is important to remember about making a complete circuit? Science Content Words: Magnetism & Electricity Page 13 Use these terms when teaching the lesson: A source of electricity with more than one cell battery A pathway for the flow of electricity circuit Something that holds many components needed to build a circuit circuit base A complete circuit through which electricity flows closed circuit An individual item in a circuit component A source of electricity; also known as a battery D-cell A component that uses the electricity from a source to make something electricity happen receiver electricity source Something that provides electric energy to make something happen A metal clip that connects wires in a circuit Fahnstock clip The material in a light bulb (usually a thin wire) that glows when heated by filament an electric current An incomplete circuit through which electricity will not flow open circuit A way to represent a circuit on a piece of paper schematic diagram A device used to open and close circuits switch Integration Hint - Science Center: Have the materials available for students to investigate lighting the bulb on their own. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. - Students should draw and label a diagram of what worked and what did not work. Assessment Opportunities - Students draw a diagram and write an explanation of how electricity flows from a D-cell to a light bulb. (see duplication masters in Teacher Guide) - Students analyze another student's drawing of a battery and bulb circuit to explain why it will or will not light. (see duplication masters in Teacher Guide) Magnetism & Electricity Page 14 Lesson 6 - Investigation 2 Part 2: Making A Motor Run Students use a circuit base to build a circuit with a D-cell and a motor. They add a switch to the circuit to control the flow of electricity. Students learn the conventions for drawing schematic diagrams of circuits. Clarifying Objectives 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change Focus Question(s) How can we make a motor run with a D-Cell? Activity Review the work with lightbulbs and call on a few students to give examples of an electricity source, electricity receiver, and circuit. Introduce the motor as another example of an electricity receiver. Present the challenge of getting electricity from a battery to this receiver. After the materials have been distributed, visit each group. Ask a successful group to share their solution to the problem of running the motor. Introduce the circuit base and reinforce the concept of circuit. Demonstrate a switch and distribute materials. Guide students to explore closed and open circuits with switches and bulbs. Direct students to draw the bulb circuit. Introduce schematic drawings and challenge students to make a schematic drawing of the same battery-switchlamp circuit they drew earlier. Make entries of essential vocabulary to the word wall and add to the content/inquiry chart. Magnetism & Electricity Guiding Questions How can you get electricity from a battery to this reciever (motor)? What does a switch do in a circuit? How is the motor circuit similar to the bulb circuit? How is it different? Which part of the circuit was the receiver in this part? How do people use schematic drawings? Page 15 Science Content Words Use these terms when teaching the lesson: A source of electricity with more than one cell battery A pathway for the flow of electricity circuit Something that holds many components needed to build a circuit circuit base A complete circuit through which electricity flows closed circuit An individual item in a circuit component A source of electricity; also known as a battery D-cell A component that uses the electricity from a source to make something electricity happen receiver electricity source Something that provides electric energy to make something happen A metal clip that connects wires in a circuit Fahnstock clip The material in a light bulb (usually a thin wire) that glows when heated by filament an electric current An incomplete circuit through which electricity will not flow open circuit A way to represent a circuit on a piece of paper schematic diagram A device used to open and close circuits switch Integration Hints - Science Center: Build a flashlight, or burglar alarm (details in extensions section of teacher guide) - FOSS Website www.fossweb.com click on Magnetism and Electricity for interactive simulations Science Notebook Helper Students should draw and label a diagram of what worked and what did not work. It is helpful to model connections with the D-Cell and motor for students. Assessment Opportunities - Students draw a diagram and write an explanation of how electricity flows from a D-cell to a light bulb. (see duplication masters in Teacher Guide) - Students analyze another student's drawing of a battery and bulb circuit to explain why it will or will not light. (see duplication masters in Teacher Guide) Magnetism & Electricity Page 16 Lesson 7 - Investigation 2, Part 3: Finding Insulators and Conductors Students build a circuit to test whether objects are conductors or insulators. They search the classroom for insulators and conductors. Clarifying Objectives 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) Focus Question(s) Which materials can be used to complete an electric circuit? Activity Hold up a bag of test objects and propose an investigation to determine if any of the test objects can be used to complete a circuit. Invite students to work with their groups to figure out a way to make a tester to find out which objects can complete a circuit. After materials have been distributed, you may need to suggest a test circuit through the set up of a battery-motorswitch circuit and opening the switch. Objects can be tested by bridging the space between the switch handle and the switch contact with the object. Guide groups to test a nail and a straw and introduce conductor and insulator; dire ct students to test and sort conductors and insulators. Propose that students find out which objects in the classroom are conductors and insulators - Remind students not to insert probes into wall sockets/outlets! Lead a discussion for students to share their findings. Add essential vocabulary to the word wall and make entries on the content/inquiry chart. Share Making Static and A Fictional Interview with Benjamin Franklin available in the FOSS Science Stories -see the Science Stories folio in Magnetism & Electricity Guiding Questions Can any of the test objects be used to complete a circuit? How do you know if a material is a conductor or an insulator? Do you notice anything similar among all the materials that are conductors? Were there any metals that weren't conductors? Why do you think they weren't? Page 17 the Teacher Guide for more information. Science Content Words Use these terms when teaching the lesson: A substance, commonly a metal such as copper or aluminum, through which conductor electricity will flow A material that prevents the flow of electricity, commonly plastic, rubber, glass, insulator or air A flash of light caused by a discharge of static electricity between two clouds or lightning from a cloud to the Earth (from FOSS Science Stories) Positive and negative electric charges that are separated from each other and are static not moving (from FOSS Science Stories) electricity Integration Hints - Science: Introduce symbols for cell, switch, wire and bulb and have students make drawings to test. - Writing: Write a story about a day without electricity. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Students could keep a glossary in their notebook where they can add words. Encourage students to use the words in their notebook entries. Definitions can be in student’s own words and/or pictures (nonlinguistic representations). Assessment Opportunities -Students should be able to provide examples of insulators and conductors and why they are classified as insulators or conductors. Magnetism & Electricity Page 18 Lesson 8 - Investigation 2, Part 4: Investigating Mystery Circuits Students work with mystery boards to reinforce the concept of conductor and check their understanding of how electricity flows through a circuit. Clarifying Objectives 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change Focus Question(s) What classroom materials are conductors and insulators? Activity Tell students they will be investigating mystery circuits as part of this performance assessment. Students assemble their circuit boards and add two long probe wires so that they may test classroom items to determine if they are either insulators or conductors. CAUTION: Students may NOT test any wall sockets. Students make a table to sort conductors and insulators in their notebook. Discuss results of the investigation as a group. Ask students, “What questions do you have now?” Following the performance assessment, share Two Reference Sources About Edison found in the FOSS Science Stories. Guiding Questions See the Science Stories folio in the Teacher Guide for information and guiding questions to accompany Two Reference Sources About Edison. Science Content Words Use terms introduced in previous investigations. Integration Hints - Literacy: Share Two Reference Sources About Edison from FOSS Science Stories. Students can research more of Edison’s inventions that involved electricity. Science Notebook Helper Magnetism & Electricity Page 19 - Student record data collected from experiment in notebook. Draw a picture of a conductor and an insulator. Assessment Opportunities - The teacher guide designates this investigation as a performance assessment. In addition to a performance task, students also complete a narrative about it. Magnetism & Electricity Page 20 Lesson 9 - Investigation 3, Part 1: Building Series and Parallel Circuits Students find ways to operate more than one component in a circuit. They invent a series circuit and discover it takes two D-cells to make two bulbs shine brightly. Clarifying Objectives 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change. Focus Question(s) How can you get a series of bulbs to light at the same time? Activity Draw/Refer to a schematic of a circuit that includes a bulb, battery, and a switch. After reviewing what students have learned about circuits so far, propose that groups work on lighting two bulbs. Prompt students to draw a schematic of a circuit they think will light two bulbs. Once students report their bulbs are glowing (dimly), introduce series circuit and generate student explanations for the dim lights. Propose that students solve the low light problem by distributing an additional D-cell, cell holder, and wire. Let students explore two D-cells in series - depending on orientation of the D-cells the lights can be very bright or there may be no light at all. Remind students to record schematics of a series circuit that successfully lit the bulbs; the diagrams should be labeled. Generate student questions, add essential vocabulary to word wall, and make entries to the content/inquiry chart. Schedule a time to share Illumiating Teamwork from FOSS Science Stories see the Science Stories folio in the Teacher Guide. Magnetism & Electricity Guiding Questions How can you get two bulbs to light at the same time? Why do you think the lamps are dim in a series circuit? Can you make the two lights bright in your series circuit? Could you build a circuit that runs a motor and a light? Can you build a circuit that runs a motor and two lights? What do we call a circuit in which all the components are connected in one big circle so there is only one pathway for electricity to flow? Why do you think the lights are dim when only one battery is used? Is the orientation/direction of the batteries important when you use two in a series circuit? Is there any way that we could get two lights to shine brightly using only one D-cell? Page 21 Science Content Words Use these terms when teaching the lesson: series circuit A circuit with only one pathway for current flow Integration Hints - Science: Following the investigation, keep the materials available for further student exploration. - Language Arts: Read the Science Story “The Story of the Edison Pioneers.” Science Notebook Helper - Students could have labeled diagrams in the science notebook showing the different pathways that electricity travels in a series circuit. Assessment Opportunities - Students complete the portion of the Reflective Questions Assessment that relates to material taught so far. - Students can complete a quick write to explain what they have learned about series circuits. Magnetism & Electricity Page 22 Lesson 10 - Investigation 3, Part 2: Building Parallel Circuits Students learn another way to operate two components. They construct a parallel circuit and find that many bulbs can operate on a single D-cell. There are six ways students can wire their circuits in parallel using two bulbs. Clarifying Objectives 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change. Focus Question(s) How are parallel and series circuits similar and different? Activity Following a review of what students learned about series circuits, introduce a new two-bulb challenge: lighting two bulbs brightly using just one battery. After materials have been distributed give students some time to build circuits; prompt students to record their circuit in their science notebooks with a labeled schematic diagram. Pause for students to share results then introduce parallel circuit. Prompt students to draw a schematic of another parallel circuit. Generate student questions or ideas for further circuit investigation. You might consider creating posters/charts of the several ways students may solve the challenge of lighting two bulbs with one battery. Sketches are labeled A-F in Investigation 3, part 2 of the Teacher guide; design C will be important in the investigation if a student group did not discover it on their own. Depending on interest, student groups may choose a different question to answer and report to the whole class, or the whole class may work together to answer one question. (Design C is the Magnetism & Electricity Guiding Questions Can you light two bulbs brightly with just one battery? What could you do with a switch? What could you do with another Dcell? In a circuit with two bulbs in parallel, where would you place a switch to turn off one bulb? Where would you place a switch to turn off both bulbs? If you are using design _ (A-F), what would you do to add a third bulb? Would another D-cell affect the brightness of two bulbs connected in parallel? Compare the two circuits - series and parallel. How are they alike? How are they different? Can you say when a series circuit might be the best design? When might a parallel circuit be the best design? How does electricity flow through a parallel circuit? Which circuit can run more components from one D-cell? What is that so? Page 23 best design of the class wants to work together to see how many bulbs they can light using one D-cell.) Prompt students to record their observations as they work. Add essential vocabulary to word wall and make entries to the content/inquiry chart. Schedule time to share A True Pioneer from FOSS Science Stories see the Science Stories folio for more information. Science Content Words Use these terms when teaching the lesson: A circuit with only one pathway for current flow series circuit parallel circuit A circuit that splits into two or more pathways before coming together at the battery Integration Hints - Science: Following the investigation, keep the investigation materials for further student exploration. - Language Arts: Research how houses are wired or Thomas Edison’s life and accomplishments. Science Notebook Helper - Students could have labeled diagrams in the science notebook showing the different pathways that electricity travels in a parallel circuit. Assessment Opportunities - Circuit Design Response Sheet - Students write a critique of another students' series-circuit design with a focus on battery orientation and the flow of electricity. Magnetism & Electricity Page 24 Lesson 11 - Investigation 3, Part 3: Solving the String of Lights Problem Students simulate the research and development of a decorative/holiday light manufacturer. They put their knowledge of series and parallel circuits to work and solve customer complaints, making recommendations for manufacturing guidelines. Clarifying Objectives 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change. Focus Question(s) What happens when a light bulb burns out? Activity Read the scenario at the beginning of Investigation 3, part 3 to set the scene about the holiday light sets and the problem of one light burns out, they all go out. Simulate a burnt-out bulb by placing a piece off index card between the base of the bulb and the metal contact in the bulb holder. Relate a burnt-out bulb to acting like an open switch. Prompt students to set up series and parallel circuits then simulate a bulb burning out to see what happens. Observe each group and check to see if they have set up series and parallel circuits properly. Allow students to share their observations and propose students put eight bulbs in a row - one team will make a series circuit and the other a parallel circuit. Visit teams as they work; invite students to drift between both groups to listen to discussion and observe circuit construction. Invite a few representatives from each group demonstrate a burnt-out bulb simulation. Distribute a copy of the Recommendation to the Board sheet Magnetism & Electricity Guiding Questions What happens when a light bulb burns out? Do you think it would make a difference of there were more bulbs in the string of lights? What would happen if you had eight bulbs in a row? Page 25 to each student to complete independently. Science Content Words Review vocabulary introduced in previous investigations. Integration Hints -Writing: Students can write a persuasive letter to convince Light-Weight Enterprises which design is best for holiday lights. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Assessment Opportunities - The teacher guide identifies this investigation as a performance assessment. - Teacher observation of students' understanding of concepts. - Students provide a written explanation on the Recommendation to the Board handout. Magnetism & Electricity Page 26 Lesson 12 - Investigation 4, Part 1: Building an Electromagnet Students discover that, when current flows through an insulated wire wound around a steel core, the steel core becomes a magnet. They find out where to wind the wire on the core to produce the strongest magnet. * Wire needs to be cut into 150 cm long strips and the ends need to be stripped. A wire cutter is included in the kit to do this. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. Focus Question(s) How can we make an electromagnet? Activity Propose making a magnet that turns on and off by reading the scenario about the junkyard crane at the beginning of Investigation 4, part 1. Review magnetic interactions through a series of brief demonstrations (found in the Teacher Guide at the beginning of Investigation 4, part 1). Challenge students to make a magnet that will turn on and off - this investigation can be open-ended or guided (see Teacher Guide for details) Once students have successfully constructed electromagnets, invite students to share their discoveries. Introduce the word electromagnet. Challenge students to find the best location to wrap the wire on the rivet to make the rounded head of the electromagnet as strong as possible. Set standards: use the same number of winds (30-40 works best), pick up washers on the rounded head of the rivet, and count the number of washers to determine the strength of the magnet. Note: Electromagnets consume a lot of energy from the D-Cell. Make sure the students have the switch in the Magnetism & Electricity Guiding Questions Can you make a miniature junkyard crane with a magnet that turns on and off? Can you make a rivet into a magnet that will turn on and off? How did you make a magnet that could turn on and off? What placement of the wire on the rivet made the strongest electromagnet? How else can you change the strength of an electromagnet? Page 27 open position unless they are actually testing to conserve your D-Cell energy. Lead a discussion for students to share results with the class. Add essential vocabulary to the word wall and add to the content/inquiry chart. Schedule a time to share From Rags to Science from the FOSS Science Stories - see Science Stories folio in the Teacher Guide for more information. Science Content Words Use these terms when teaching the lesson: Wire wound repeatedly around a central core coil core The material around which a coil is wound electromagnet A piece of iron that becomes a temporary magnet when electricity flows through an insulated wire wrapped around it (also in FOSS Science Stories) Integration Hints - Visit the Electromagnet Simulator at www.fossweb.com, Magnetism & Electricity module. - Writing: Write a short story describing real or imaginary encounters with electromagnets. - Math: Measurement of wire, graphing number of washers picked up by the electromagnet, weighing the washers that were picked up and recording results, averaging two or more group’s results and graphing the data. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Assessment Opportunities - Students should explain what an electromagnet is and how to make it stronger. They should use their data to back up their conclusions. Magnetism & Electricity Page 28 Lesson 13 - Investigation 4, Part 2: Changing Number of Winds Students experiment to find out how the number of winds of wire affects the strength of magnetism. After collecting data for a 20-wind, 30-wind, and 40-wind electromagnet, students graph their results. They predict the strength of magnetism based on the graph during a teacherled discussion. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. Focus Question(s) How does the number of winds affect an electromagnet? Activity Recap the previous investigation and allow students to share their suggestions to change the strength of an electromagnet. Invite students to work in groups to decide how they might find out how the number of winds affects the strength of magnetism of an electromagnet. Circulate and visit each group to check on their plans. If a group is stalled, suggest they investigate how many little washers can be lifted with an electromagnet made with 20 winds of wire. Distribute materials for student groups to begin their investigations. Distribute the student recording sheet Winding Electromagnets ordered pairs of data can be recorded; number of winds in the left column and number of washers lifted in the right column. Students may need guidance in designing their investigations, so suggest they: - Find out how many washers a 20wind electromagnet can lift. - Find out how many washers a 40wind electromagnet can lift. - Predict how many washers a 30-wind Magnetism & Electricity Guiding Questions How could you find out if the number of winds might make a difference in the strength of an electromagnet? How many washers can a 20-wind electromagnet lift? A 40-wind electromagnet? What was the general pattern you saw in the way the number of winds affects the strength of an electromagnet? Page 29 electromagnet can lift. - Find out how many washers a 30wind electromagnet can lift. Call students together to share results with the class. Graph the results on a transparency or under a document camera to orient students to the graph on the Winding Electromagnets recording sheet. Point out: - numbers along the x-axis represent the number of winds(each line represents two winds) - numbers along the y-axis represent the number of washers lifted(each line represents two washers) - how to locate and plot a hypothetical point on the graph Have students graph their data. Guide students to use their graphs to make predictions. If time, let student groups test their predictions. Add essential vocabulary to word wall and new concepts or questions to the content/inquiry chart. Schedule a time to share How Electromagnetism Stopped a War from FOSS Science Stories - see Science Stories folio in the Teacher Guide for more information. Science Content Words Use these terms when teaching the lesson: Something that organizes data visually to show a relationship between two graph things (review) prediction An educated guess based on data or previous experience (review) Integration Hints - Language Arts: Students research how electromagnets are used in common devices such as doorbells, pencil sharpeners, and household appliances. - Math: Measurement of wire, graphing number of washers picked up by the electromagnet, weighing the washers that were picked up and recording results, averaging two or more group’s results and graphing the data. - Language Arts: Read the Science Story: “How Electromagnetism Stopped a War.” Magnetism & Electricity Page 30 Science Notebook Helper Students should explain what an electromagnet is and how you make it stronger. They should use their data to back up their conclusions. Assessment Opportunities - Student progress can be assessed on the response sheet Reverse Switch, available in the Teacher Guide or through Teacher observation, anecdotal notes, review of science notebook entries. Magnetism & Electricity Page 31 Lesson 14 - Investigation 4, Part 3: Investigating More Electromagnets Students propose other ways to change the strength of the electromagnet. After listing a set of variables, students plan and conduct an experiment. Clarifying Objectives 4.P.1.1 Explain how magnets interact with all things made of iron and with other magnets to produce motion without touching them. 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. Focus Question(s) What other ideas can we investigate about electromagnets? Activity Recap previous electromagnet investigations and invite students to share how the number of winds of wire affects the strength of magnetism. Generate and record student ideas and questions. Invite groups to begin planning their investigation so that all questions are being addressed. For example, one group may investigate the tightness of coils, while another investigates the direction of wraps, etc. Distribute Electromagnet Investigation record sheets, or prompt students to record in their science notebooks. Visit students as they work to see if they are completing a reasonable investigation that will answer they question they have chosen. Invite each group to share a brief presentation of their investigation and its results. Following each presentation, allow students to ask questions that focus on the procedures and results, or on items that need clarification. Add new concepts/results of the investigations to the content/inquiry chart: - Tighter coils produce a stronger Magnetism & Electricity Guiding Questions How else can you change the strength of an electromagnet? Do you have any more ideas you think you could investigate? Does it matter how tight the coils are? What would happen is you wound half the coils one way and half the coils the other way? What would happen if you added another D-cell to the circuit in series? In parallel? What happens if thinner or thicker wire were used? What are the results of your investigation? Page 32 electromagnet. - All coils need to be wound in the same direction. - A D-cell added in series makes a stronger electromagnet; added in parallel, does not strengthen the electromagnet. - Thicker wire makes a stronger electromagnet. Schedule a time to share Magnets and Electricity in Your Life, from FOSS Science Stories - see Science Stories folio in Teacher Guide for more information. Science Content Words Review terms introduced in previous investigations. Integration Hints - Language Arts: Students write a "How to" piece to explain various ways to strengthen an electromagnet. - See Mathematics Extension Problem of the Week at the end of the Investigation 4 folio in the Teachers Guide. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. - Students plan and carry out an investigation, changing one variable in the electromagnetic system to find out what happens. Assessment Opportunities - This lesson is a performance assessment. Teacher observation; Student response sheet Electromagnetic Investigation, available in the Teacher Guide. Magnetism & Electricity Page 33 Lesson 15 - Investigation 5, Part 1: Reinventing the Telegraph Students apply their knowledge of circuitry and electromagnetism to build a telegraph. They invent a code and use their telegraphs to send messages to each other. Clarifying Objectives 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change Focus Question(s) How can we use what we’ve learned to build a telegraph? Activity Invite students to share and discuss communication devices they know about and use (telephone, cellphone, radio, TV, computer, newspaper, magazines, etc.) Follow up by telling students they will build a special communication device using their knowledge of circuits and electromagnets. Share the story at the beginning of Investigation 5, part 1 in the Teacher Guide to set the historical scene. Propose a telegraph challenge by asking students if they can make a telegraph. Demonstrate how the rivet can be pressed into the indentations on the circuit base to hold the electromagnet securely in place; demonstrate how to insert the steel strip between the plastic arches on the circuit base. (See Teacher Guide for diagrams) Circulate the classroom to monitor telegraph assembly; the circuit should be set up just like it was in the last investigation. The gap is a crucial design feature - the gap cannot be too big or too small. Allow successful groups to share their Magnetism & Electricity Guiding Questions Can you make a telegraph? How can you use your telegraph to send a message to another person? What is the difference between science and technology? What is a telegraph? How does a telegraph send messages? What is a code? Page 34 design or make suggestions to other groups. Once all groups have a working telegraph, propose a group discussion about sending messages to another person. Propose and display the STREAM code: S=1, T=2, R=3, E=4, A=5, M=6; 2 clicks followed by 5 clicks then 3 clicks would spell TAR. Once the code is established, invite students to take turns sending singleword messages to their groups. Follow up with a class discussion; add essential vocabulary to the word wall and new concepts to the content/inquiry chart. Note: Have students remove Dcells before putting telegraphs away; the telegraphs can remain assembled. Science Content Words Use these terms when teaching the lesson: A set of signals that represents letters or words for sending messages code gap The space between a steel strip and an electromagnet key A switch that completes the circuit in a telegraph system technology Applying the results of scientific research telegraph A device for sending coded messages by signals produced by closing and opening an electric circuit Integration Hints - Language Arts/Social Studies: Research the telegraph and how people used it to communicate. - Science: Build a cardboard telegraph (details in guide) Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Assessment Opportunities - Informal observations: Are students trying to make a complete circuit that includes the power source, switch, and electromagnet? Can students explain (operational level) how an electromagnet works? Magnetism & Electricity Page 35 Lesson 16 - Investigation 5, Part 2: Sending Messages Long Distance Students hook up two telegraphs so they can send messages from one group to another. In meeting the challenge, students have to solve a number of problems, including circuit design, resistance imposed by the long lines, and long distance procedural signals. Clarifying Objectives 4.P.1.2 Explain how electrically charged objects push or pull on other electrically charged objects and produce motion. 4.P.2.1 Compare physical properties of samples of matter: (strength, hardness, flexibility, ability to conduct heat, ability to conduct electricity, ability to be attracted by magnets, reactions to water and fire.) 4.P.3.1 Recognize the basic forms of energy (light, sound, heat, electrical, and magnetic) as the ability to cause motion or create change Focus Question(s) Can we make a telegraph that will send a message over a long distance? Activity Ask students what they would need in order to send messages over the telegraph if groups were in different rooms or if one group was inside the classroom and another group was outside. Introduce the lengths of telegraph wires and point out that each wire is actually two wires stuck together. (This will be important as students trace the flow of electricity from one circuit base to another.) Pair up groups to set up two-way communication and explain when one group presses its key, the electromagnet on the other circuit base produces a click. As students begin, point out Fahnstock clips on the circuit base near the arches; these clips are helpful if students need to connect wires to wires as twisting wires may cause the wire ends to break off. Visit student groups and provide hints or troubleshooting tips (available in Investigation 5, part 2 of the Teacher Guide). Prompt students to record how to Magnetism & Electricity Guiding Questions What if two groups were in different rooms, or one group was outside the classroom with its telegraph and the other group was inside with its telegraph? What would they need in order to send messages back and forth? Can you explain how the telegraph works? What were some problems you encountered in telegraph communication and how might you improve the system? How is a telegraph like a telephone or a walkie-talkie? How is it different? Building a telegraph requires using your knowledge of science to make something useful. We call this technology. What kinds of technology are important to you in your everyday life? How do you connect two telegraphs? Page 36 connect a long-distance telegraph on recording sheet Long-Distance Telegraph or in their science notebooks. As students discover that long distance communication provides a new level of challenge, propose procedural signals in addition to the click code - signals such as "start of message," "end of message," or "repeat" are often needed and can be generated from a series of double clicks. Invite students to share their experiences with the telegraphs; add essential vocabulary to the word wall and make entries to the content/inquiry chart. Schedule time to share Morse Gets Clicking: A Story of Samuel Morse from FOSS Science Stories - see the Science Stories folio in the Teacher guide for more information. Science Content Words In addition to terms introduced in previous investigations, use these terms when teaching the lesson: long distance far away Integration Hints - Language Arts: Read the Science Story: “Morse Gets Clicking.” - Science: Students build a cardboard telegraph - directions available on a blackline master in the Teacher Guide. - Language Arts/Social Studies: Student research other codes such as sign language, hieroglyphs, Morse code, or braille. Investigate emergency codes such as 911 or universal distress calls such as SOS or Mayday. Science Notebook Helper - Students record the focus question, prediction, data related to the investigation, and conclusions in their science notebooks. Assessment Opportunities - Teacher observation, anecdotal notes, review science notebook entries. Magnetism & Electricity Page 37