/ I / the Phenomenon |
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The strength of electric and magnetic forces depends on 3 factors.
[CER] DISCUSSION QUESTION:
Which factor is the most important in determining the strength of force fields? Make a claim then gather evidence to support and justify your claim throughout this lesson. |
/ Ii / Investigate
1. Electromagnetism - investigate how an electric current can produce a magnetic field and how the number of coils of a solenoid impacts its strength.
2. Electromagnet Magic - build an electromagnet and investigate whether or not electromagnets are stronger than permanent magnets. 3. Electromagnet Mania - investigate how the strength of the magnetic field produced by an electromagnet can be adjusted by varying factors such as the number of turns in the coil, the amount of current flowing through the wire, and the properties of the core material. 4. Making Better Motors - How do more magnets impact the strength of a motor? 5. Magnet Racers - design a race car to investigate factors that determine the strength of a magnet. |
/ iII / Level Up!
During this lesson you will learn more about the underlying forces that explain the variety of interactions we observed between objects.
✎Notes:
- Electric and magnetic (electromagnetic) forces can be attractive or repulsive, and their sizes depend on the magnitudes of the charges, currents, or magnetic strengths involved and on the distances between the interacting objects.
- Gravitational forces are always attractive.
- There is a gravitational force between any two masses, but it is very small except when one or both of the objects have large mass—for example, Earth and the sun.
- Long-range gravitational interactions govern the evolution and maintenance of large-scale systems in space, such as galaxies or the solar system, and determine the patterns of motion within those structures.
- Forces that act at a distance (gravitational, electric, and magnetic) can be explained by force fields that extend through space and can be mapped by their effect on a test object (a ball, a charged object, or a magnet, respectively).
/ IV / choose your path
ACCOMPLISHED [+3 points]
Predict the strength of an electromagnet if you increase the number of coils. Explain how you made your predictions. Explain how we could create a fair test to test your predictions. ADVANCED [+4 points]
Using the, "electromagnetic strength" data ask your own questions about the factors that affect the strength of an electromagnet you could investigate in the classroom. EXPERT [+5 points]
How can you make an electric motor faster? Propose a question you could investigate scientifically within the scope of the classroom to increase the speed of an electric motor. |
/ V / Knowledge Check
To produce electricity, a turbine generator converts mechanical energy to electrical energy. In the cases of natural gas, coal, nuclear fission, biomass, petroleum, geothermal, and solar thermal, the heat that is produced is used to create steam, which moves the blades of the turbine.
It operates by creating an electric current by moving wire next to a magnet. Scientist Michael Faraday discovered this phenomenon in 1831 when, after moving a magnet through a loop of wire, he noticed that an electric current began in the wire.
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✓ MASTERY CHECK
National Research Council 2012. A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas. Washington, DC: The National Academies Press. https://doi.org/10.17226/13165
This site contains original content that may not be authorized for use by the creator and is legally used under the fair use principles section 107 of the Copyright Act of 1986 (17 U.S. Code § 107)
The official NGSS website. https://www.nextgenscience.org
PS2.B, MS-PS2-3
Ask questions about data to determine the factors that affect the strength of electric and magnetic forces. (Cause & Effect) [MS-PS2-3]
This site contains original content that may not be authorized for use by the creator and is legally used under the fair use principles section 107 of the Copyright Act of 1986 (17 U.S. Code § 107)
The official NGSS website. https://www.nextgenscience.org
PS2.B, MS-PS2-3
Ask questions about data to determine the factors that affect the strength of electric and magnetic forces. (Cause & Effect) [MS-PS2-3]