Attention Getting Question:
How can you move an object without touching it? If it’s magnetic, you can use a magnet! Magnets are at work all around you! Let’s find out more about them.
One way scientists identify or classify objects is by determining if they are magnetic. Most magnets are made of iron or steel.The only metals a magnet will attract are made of iron, steel, cobalt, or nickel. You can check if an object is magnetic or not by simply holding a magnet near it. If the object sticks to the magnet, it is magnetic.
Magnetism is a force that pulls across a distance.If you open your desk drawer and move a magnet over the objects, the magnet will pick up items that are magnetic. Your magnet may pick up some paper clips, staples, and a pair of scissors. It will not pick up paper, rubber bands, erasers, or pencils that may be in your desk because they are not made of magnetic materials.
A very strong magnet can pull an object from far away, but how? There is a magnetic field that surrounds every magnet. A magnetic field is where the force of a magnet can be felt. To see the magnetic field of a magnet,you can place a piece of paper over the magnet. Sprinkle iron filings all over the paper and the filings will create a pattern of lines. These lines are called magnetic lines of force. Each type and strength of magnet will have a unique magnetic field. You can also see that most of theiron filings are attracted to the north and south poles of the magnet. A pole is an area of a magnet where its magnetism is strongest. Every magnet has a north and south pole.Opposite poles attract or pull on each other,so the north pole of a magnet is attracted to the south pole of a magnet. If you try to place a north pole of a magnet near a north pole of another magnet, you will feel them repel or push away from each other.
Have you ever used a compass while you were hiking with your family? If you have, you know that the needle inside a compass always points north. That is because the earth is a giant magnet. It has two magnetic poles. The needle in a compass is a tiny magnet and it is attracted to the earth’s north magnetic pole. Even when you turn around with the compass in your hand, the needle will point north.
Some materials can be made into magnets. If a paper clip is attracted to a magnet, the paper clip becomes magnetized. It will now attract another paper clip. Try it yourself and see how many paper clips you can magnetize.
Think about the world around you. Magnets can be found in toys, electronics, appliances, and many other things! Scientists even think that the earth’s magnetic field helps migrating birds find direction. Magnets help us do things, from holding a picture on the refrigerator to launching a rocket into space!
Magnets are all around you. You can determine if a material is magnetic by placing a magnet near it. Magnetism is the force that pulls across a distance. A magnetic field is where the force of a magnet can be felt. Every magnet has a north pole and a south pole.A pole is an area of a magnet where its magnetism is strongest. Opposite poles attract or pull ononeanother. The same poles will repel or push away from each other.