1. Science
Activity: Stnd 01
Date
Standard 01: 8.PS2.1 Magnetism and Electricity
Design and conduct an investigation about magnetism and electricity. Examine factors that increase or diminish the electric current and the magnetic field strength.
Key Focus: Science and Engineering Practice(s)
Develop and Use Models
Key Focus: Crosscutting Concept
Recognize cause and effect relationships
1st Investigation: Construct and test an electromagnet
2nd Investigation: Do an electromagnetic induction simulation.
3rd Investigation: Construct and test an electrical motor

2. Electromagnets can be turned on and off as needed
Solenoid
Iron Core
Source of
Electricity
Electromagnets can be turned on and off as needed
You can adjust the strength of an electromagnet two ways
1) Increase or decrease the electrical current
2) Increase or decrease the number of coils

3. Electromagnets: Three Main Components
(1) Solenoid
(2) Iron Core
(3) Source of Electricity
Identify the 3 Components
Identify the 3 Components
Identify the 3 Components

4. How do we use electromagnets?
SPI
Electromagnets
Notes
Science
How do we use electromagnets?
Commonly found in electrical motors and switches
Also used to…
To lift objects
Example: Junkyard crane-magnets
Example: Maglev trains
To propel objects
Example: Railguns as weapons
Example: Magnetic catapults (launch platforms)
To look inside of people
Example: Magnetic Resonance Imaging (MRI)

5. How do we use electromagnets?
To lift objects: Example: Junkyard crane-magnets
Video Clip: Scrapyard Electromagnet In Action

6. How do we use electromagnets?
To lift objects: Example: Maglev trains (magnetic levitation)
Video Clip (show 1st 45 sec): How Maglev Trains Work
Maglev Train
Maglev Train

7. How do we use electromagnets?
To propel objects: Example: Railguns as weapons
Video Clip (stop at 2 min:15 secs): US Navy Railgun
Rail Gun
Rail Gun

8. How do we use electromagnets?
To propel objects: Magnetic Catapult (for spacecraft)
NASA is testing magnetic catapults to replace rockets
Magnetic Catapult

9. How do we use electromagnets?
To propel objects: Magnetic catapults (for aircraft)
Video Clip (2:46): Aircraft Carrier-Magnetic Catapult

10. How do we use electromagnets?
To Look Inside of People: Magnetic Resonance Imaging (MRI)
Video Clip: MRI Magnetic Field Strength

11. Construct an Electromagnet Link (2:19): Build an Electromagnet
A) Build an electromagnet after watching the video shown below.
B) Use it to pick up a paper clip. Try more than one paper clip.
C) Adjust the number or wraps/coils on it.
D) Use different sized iron cores.
E) Place two batteries in series.
Link (2:19): Build an Electromagnet
What cause and effect connection do you observe regarding
the number of coils and the strength of the magnetic field?