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Dona Breen Simple Electromagnet and Magnetism SOL(s): 4.3e) Simple electromagnet and magnetism 4.1a) Predictions and inferences are made, and conclusions are made based on data; 4.1f ) Independent and dependent variables are identified; 4.1g) Constants in an experimental situation are identified; 4.1h) Hypotheses are developed in a cause and effect relationship; 4.1i) Data are collected, recorded, and analyzed using a line graph; Instructional Objectives: SWBAT construct a simple electromagnet using a wire, iron nail, a dry cell. SWBAT design and conduct an investigation to determine the strength of an electromagnet. SWBAT record and analyze data to determine how to increase the strength of the electromagnet. SWU an electric current creates a magnetic field. SWU that attaching each end of a wire to the positive and negative poles of a dry cell, then wrapping a number of coils of this wire around the iron nail creates a closed circuit in a simple electromagnet. SWU that the more coils wrapped around the iron nail, the stronger the electromagnet. Lesson Segment & Time Est. Introduction (Predict, Explain) 15 minutes Materials Instructional Sequence Teacher/Student Actions Student sheet asking for predictions and directions for how to use the website Predict: Elicit Students’ Ideas: Ask students to predict what materials they would use to make an electromagnet and how they could measure the strength of the electromagnet. Perhaps they should explain why the materials they chose would be helpful to make an electromagnet. S. will make predictions and then share their predictions in a class discussion. T. will introduce the website and go over the questions on the student sheet. S. will work in with a partner to manipulate the variables given in the website to find and discuss the answers to questions. T. will go around classroom checking with partners for understanding of the concepts. S. will make an electromagnet and check to make sure they have a closed circuit. T. will guide class discussion on developing the research question and hypothesis. Direct students that are not on track back to the visualization Computer and internet access to website Explain: Discuss students’ predictions: S. share predictions/explanations in a class discussion. Introduce the website: http://www.fossweb.com/delegate/ssi-wdf-ucmwebContent/Contribution%20Folders/FOSS/multimedia/Magnetism_and_Electricity/electromagnet .html and go over the questions on the student sheet. Students will work in pairs to answer the questions on the student sheet. Students will then discuss their answers. Body (Observe) (Explain) 30 minutes Electromagnet Investigation Sheet 6 volt dry cells, insulated wire cut into 3 foot lengths, iron nails, metal paper clips Students working in groups of 4 will use the materials to create a closed circuit. As a class we will develop the research question and hypothesis to make sure that we are all looking for the same type of results. The groups will then identify the independent variable, the dependent variable, and constants for the investigation. 1 Dona Breen Lesson Segment & Time Est. Materials Instructional Sequence Observe: S. conduct the investigation using the procedures on the electromagnet investigation sheet and record their observations on the T-chart. Explain: (Small groups) S. discuss observations and their explanation for these observations in small groups then develop a conclusion. Closure (Explain, con’t) graph paper Exit Pass As a class we will set up labeled graphs to display our results. S. will record their results on a group graph. Group graphs will be displayed on the board and students will compare graphs and identify similarities and differences. Explain): Whole-class discussion of small group observations/explanations. Students determine if the hypothesis was proved or disproved. Provide the scientific explanation to students. 15 minutes Total Time = 60 minutes Students independently answer three questions found on an Exit Pass and turn it in before leaving class. Questions for students: Why did increasing the number of coils increase the strength of the electromagnet? Scientific Explanation: Increasing the number of charged electric coils wrapped around the iron nail, increasing the strength of the electromagnet demonstrated by an ever increasing number of paper clips that it can pick up. Assessment Plan: Student prediction sheet and procedures for understanding the website. Electromagnet Formative assessment is ongoing as students complete each step of the lesson. Discussions help to eliminate any misconceptions. Individual summative assessment is found on the Exit Pass to determine if some students need further support to understand the science concepts. Teacher/Student Actions S. will work in groups to identify the independent variable, the dependent variable, and the constants. S. will record the independent and dependent variables as the headers for the T-chart. S. will conduct the trials and record the data on their t-chart. S. will discuss their observations in small groups and whole class. S. will label graphs and give the graph a title. S. will record their findings on a group graph. T. will display group graphs on the board. S. will compare graphs, identify similarities and differences. S. will determine if the hypothesis was proven/ disproven and discuss explanations. S. will answer two questions on an Exit Pass and turn in. T. will review student answers to questions to check understanding of science concepts. S. will contribute to small group and whole class discussions. S. will complete all student sheets. T. will listen to small group and whole class discussions to 2 Dona Breen Lesson Segment & Time Est. Materials Investigation Sheet Group graphs of investigation results. Instructional Sequence Teacher/Student Actions clear up any misconceptions. T. will observe student observations and review the work students turn in. T. will evaluate student responses to plan the next lesson. Exit Passes Formatted: Normal, Space After: 10 pt, Line spacing: Multiple 1.15 li, Tab stops: Not at 0.19" + 0.25" 3 Dona Breen Name _____________________________ Date ___________________ Simple Electromagnet and Magnetism Prediction: 1. What materials would you choose to make an electromagnet? Why? _______________________________________________________________________________________________________________________________________ _____________________________________________________ 2. How can you measure the strength of an electromagnet? _______________________________________________________________________________________________________________________________________ ______________________________________________________ Directions: To generate answers to the above questions you will use the Build Your Own Electromagnet site found at http://www.fossweb.com/delegate/ssi-wdf-ucm- webContent/Contribution%20Folders/FOSS/multimedia/Magnetism_and_Electricity/electromagnet.html . Follow the directions below to explore these questions: 1. What materials did they use to make an electromagnet? ______________________________________________________________________________________________________________________________ 2. What energy source is used to create the electromagnet? ______________ 3. What options do you have to change the strength of the electromagnet? _______________________________________________________________________________________________________________________________________ ______________________________________________________ 4. How is the strength of the electromagnet measured? _________________ ______________________________________________________________________________________________________________________________ 4 Dona Breen Name _______________________________ Date _____________________ Electromagnet Investigation Research Question: How can we increase the strength of an electromagnet? Directions: Work in small groups to create an electromagnet using the following materials. Next, decide how you can change the materials to make your electromagnet stronger. Remember to create a hypothesis that can be measured and is written in the “If . . ., then. . .” format. Record your observations on a T-chart. Materials: 6 Volt dry cell, insulated wire, iron nail, metal paper clips, and this investigation sheet. Hypothesis: If _______________________________________________________________________, then ________________________________________________________________________________. What is your independent variable? ______________________________________________________ What is your dependent variable? ________________________________________________________ How will you measure your dependent variable? ____________________________________________ What are the constants? ________________________________________________________________ Record your findings on the T-chart below. (independent variable) (dependent variable) 5 Dona Breen Did your findings support your hypothesis? Explain your answer. ______________________________ _____________________________________________________________________________________ Explain: How did we increase the strength of the electromagnet? Why did this increase the strength? _______________________________________________________________________________________________________________________________________ ________________________________________________________________________________________________________________________ Create a graph of your results on the attached graph paper. Name __________________________ Date _______________ Exit Pass 1. List the materials needed to make an electromagnet. ________________________________________________________________ 2. How can you measure the strength of an electromagnet? __________________________________________________________________________________________________ ________________________________ 3. Why did increasing the number of coils increase the strength of the electromagnet? __________________________________________________________________________________________________ ________________________________ 6