Magnets Magnets and More Magnets Explor e Using

Magnets, Magnets and More Magnets

Explor e Using the material given, find things around the room that stick to it.

Explor e Using the material given, test what happens when they are close to each other.

Explor e Using the material given, test what happens when you thread a pencil with one and, then, add the other one.

Explor e Using the material given, test what happens with paper clips. How many can the magnet hold at one time?

Explor e Using the material given, test what happens with masking tape and paper clips. • Tape three pieces of masking tape (stacked on top of each other) to the magnet. Try to pick up paper clips. • Continue to add 3 pieces of tape after each try. • How many paper clips can the magnet with tape hold?

Magnets �attract (pull toward) metals made of iron �repel (push away) things not made of metal

Bar Magnet This is a bar magnet. The N is the north pole. The S is the south pole.

Bar Magnet The north end of this magnet will the south end of another magnet. The north end of this magnet will push the north end of another magnet.

Horseshoe Magnet The north end of this magnet will the south end of another magnet. The north end of this magnet will push the north end of another

Ring Magnet Ring magnets also have a north and south pole: • N can be on the outside and S on the inside – or • N on one edge and S on the other –or • N on the top side and S on the bottom.

Rod (cow) Magnet Rod magnets also have a north pole and a south pole. Cows eat everything, including nails and wire. This can make them very sick. Cow magnets help keep cows healthy.

Wand Magnet Rod magnets also have a north pole and a south pole.

Compass This is a compass. The red arrow is pointing North. People use a compass when they travel.

Things to know about magnets �A magnet has two ends called poles • North poles point north. • South poles point south. �The north pole of one pole attracts the south pole of the other. �Like poles push away (repel), unlike poles pull (attract). �Magnets act at a distance. �Magnets attract only magnetic materials. �Cut a magnet in half, each new magnet will have a north pole and a south pole.

�The north pole of a magnet points toward the Earth’s north pole. �The south pole of a magnet points toward the Earth’s south pole.

Types of Magnets �Permanent magnets Ø refrigerator magnets �Temporary magnets Ø hematite, paperclip, nails �Electromagnets Øwire coil with current flowing Østrength and polarity change with change in current flow