TEACHER COPY Magnetism BrainPOP
1. A magnet is any material that produces a magnetic field is basically a
magnetic field. A
force field. It’s an invisible area of
force that extends all around a magnet. That force attracts metals like iron, nickel, and cobalt. When those metals fall inside a strong enough magnetic field, they become temporarily magnetic. 2. All metals have arrangements of
atoms inside them called
magnetic domains. Usually, the poles of these domains are jumbled up, so they cancel each other out. In a magnet, all of the domains are lined
up, so that they face in the same direction.
That creates a magnetic
field.
3. Magnetic fields get
weaker the further away from the magnet you
go. Every magnet has a
north and south pole. It’s true that
opposites attract – a north pole will attract a
south pole. Two of
the same poles repel each other. Any magnetic metal has and south poles too, and
north
weak magnetic fields surrounding them.
4. Comes work because the
Earth has its own magnetic field, with
magnetic north and south poles. It pulls at lightly balanced pieces of
metal, like a com needle. That’s why a com needle always points north! 5. When you run an electric creates a
current through a piece of wire, it
magnetic field around the wire. That’s an
electromagnet. You can control the
strength of the magnetic field
by changing the amount of electric
current you run through the
wire. 6. Why were things attaching themselves to Moby? Be specific. What kinds of things were sticking to Moby? Tim turned up Moby’s current from 50 to 150 because Moby is a robot, and robots have electromagnets. Tim increased the strength of the magnetic field by increasing the electric current. Metal objects were sticking to Moby, like paper clips, nails, a tin can, and a refrigerator.