Poles and Forces
North and South
What are the 2 poles of a magnet?
Out of these three items—a wooden ruler, a plastic bottle, or an iron nail—this is the only one a magnet will stick to.
What is Iron nail?
This is the invisible "danger zone" or area around a magnet where it can still pull or push objects.
What is magnetic field?
Unlike a permanent magnet on your fridge, this type of magnet only works when this "sparky" form of energy is flowing through it.
What is Electricity?
You’ll find giant electromagnets here, where they are used to pick up and move old cars and crushed metal.
What is a scrap yard?
Even though you can't see it, we are all living on top of a giant magnet that has a North Pole, a South Pole, and a magnetic field that protects us from space radiation.
What is the Earth?
They repel
What happens when two north poles are brought together?
While most metals aren't magnetic, iron belongs to a small "club" of magnetic metals that also includes this coin-named element.
What is Nickle?
On a map of a magnetic field, the invisible lines always start at the North pole and end at this pole.
What is the south pole?
To build a simple electromagnet, you must take a long piece of this and wrap it many times around a metal center.
What is wire?
Electromagnets are way better than "fridge magnets" for cranes because they have this special "power" to be...
What is turned off and on?
They attract
What happens when a north pole and a south pole are brought together?
Materials like plastic and wood aren't magnetic because their internal "tiny magnets" are pointing in these different, messy directions.
What is Random?
On a bar magnet, the magnetic field is at its strongest and most powerful when you are touching these two ends.
What are the 2 poles?
While you could use a wooden stick, your electromagnet will be much stronger if the "core" in the middle is made of this metal.
What is iron?
If a crane operator tries to pick up a heavy truck but it won't budge, it might be because the battery is low on this "flow."
What is current (or electricity)?
To push away
What does “repel” mean?
In magnetic materials, atoms hang out in these "neighborhoods" where all the magnetic fields point the same way.
What are Domains?
In a science lab, you can make the invisible magnetic field appear by sprinkling these tiny "metal crumbs" onto a piece of paper.
What are Iron filings (powder)?
To give your electromagnet "super strength," you can either add more battery power or do this to the wire.
What is add more coils?
To fix a "weak" crane and make it pick up more weight, an engineer might add more of these wire loops around the center.
What are coils?
This happens when you touch a strong magnet to a plain iron nail, causing the nail to act like a magnet and pick up other objects.
What is Induced (temporary) magnetism?
When a piece of metal finally becomes magnetized, all of its messy internal domains do this to work together.
What is line up?
Because a magnetic force can only push in one direction at a time, these drawn lines on a map will never do this to each other.
What is cross or overlap?
This is the main reason we use electromagnets in junk yards: once you flip the switch to "off," the magnet does this.
What is loses its magnetism?
An electromagnet with a plastic center wouldn't lift much, because this specific metal "core" is needed to make the field stronger.
What is Iron?