Download Simple Electromagnet and Magnetism

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.
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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
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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"
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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? _________________
______________________________________________________________________________________________________________________________
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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)
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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?
__________________________________________________________________________________________________
________________________________
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