Magnets
Published on Nov 23, 2015
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PRESENTATION OUTLINE
MAGNETS
Photo by Lyn Lomasi
MAGNETISM
- Magnetism is a force where objects are attracted or repelled to one another.
- It was discovered as a rock that attracted iron by either the Greeks or the Chinese in the first century B.C.
Photo by Aquila-chrysaetos
CHARACTERISTICS OF MAGNETS
- Seek the path of least resistance
- Never cross one another
- They all have the same strength
- Their density decreases as the distance increases from the poles
Photo by explainthatstuff
MAGNETS ATTRACT AND REPEL
- Magnets will be attracted by their opposite poles, and will repel with the same pole.
- There is no definite answer to why magnets attract and repel.
Photo by Scott Hamlin
THINGS THAT HAVE A NORTH AND SOUTH POLE
- Magnets have a North and South Pole
- The earth has a North and South Pole
Photo by dno1967b
MAGNETIC FIELDS
- The magnetic effect of electrical currents and magnetic materials.
EARTHS MAGNETIC FIELD
- Earth's magnetic field was created by the conductive material of its core.
- It protects us from charged particles of the solar wind and cosmic rays that would get rid of Earth's upper atmosphere.
Photo by Image Editor
THE NORTHERN LIGHTS
- Also know as an aurora is created by charged particles entering the atmosphere to create colorful lights in the sky.
Photo by Tor Even Mathisen
MAGNETS AS ELECTRICITY?
- A magnets magnetic field pushes and pulls electrons in objects near them to make them move. Which then cause electricity.
Photo by bricolage.108
ELECTROMAGNET
- An electromagnet is a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
- You can make it from copper wire, a battery, a nail, and paper clips. You connect the nail and battery with the wire and then let it touch the paper clips.
Photo by cobalt_grrl
HOW A COMPASS WORKS
- The earths magnetic field attracts a compasses north to our north pole because the compass needle is a magnet.
Photo by quimby
MAGNETIC LEVITATION
- Magnetic levitation is when an object is suspended with no support other than a magnetic field.
- A magnetic force is used to counteract the effects of gravity causing an object to float.
Photo by endolith
MAGNETS IN TECHNOLOGY
- Magnets can be found in hard drives of your computer or cell phones because it helps store the information that you put in them.
- MRI machines are pretty much giant magnets put together to show detailed human body tissues and structures.
Photo by Stuck in Customs
INTERESTING FACTS
- Not all metals are strongly attracted to magnets, like platinum and aluminum.
- People use magnets a toys for kids. I even used them!
Photo by Sorcyress
